1666 lines
58 KiB
JavaScript
1666 lines
58 KiB
JavaScript
// Copyright 2006 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Utilities for manipulating arrays.
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*
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* @author arv@google.com (Erik Arvidsson)
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*/
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goog.provide('goog.array');
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goog.require('goog.asserts');
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/**
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* @define {boolean} NATIVE_ARRAY_PROTOTYPES indicates whether the code should
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* rely on Array.prototype functions, if available.
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*
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* The Array.prototype functions can be defined by external libraries like
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* Prototype and setting this flag to false forces closure to use its own
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* goog.array implementation.
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*
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* If your javascript can be loaded by a third party site and you are wary about
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* relying on the prototype functions, specify
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* "--define goog.NATIVE_ARRAY_PROTOTYPES=false" to the JSCompiler.
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*
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* Setting goog.TRUSTED_SITE to false will automatically set
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* NATIVE_ARRAY_PROTOTYPES to false.
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*/
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goog.define('goog.NATIVE_ARRAY_PROTOTYPES', goog.TRUSTED_SITE);
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/**
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* @define {boolean} If true, JSCompiler will use the native implementation of
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* array functions where appropriate (e.g., {@code Array#filter}) and remove the
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* unused pure JS implementation.
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*/
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goog.define('goog.array.ASSUME_NATIVE_FUNCTIONS', false);
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/**
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* Returns the last element in an array without removing it.
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* Same as goog.array.last.
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* @param {IArrayLike<T>|string} array The array.
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* @return {T} Last item in array.
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* @template T
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*/
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goog.array.peek = function(array) {
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return array[array.length - 1];
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};
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/**
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* Returns the last element in an array without removing it.
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* Same as goog.array.peek.
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* @param {IArrayLike<T>|string} array The array.
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* @return {T} Last item in array.
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* @template T
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*/
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goog.array.last = goog.array.peek;
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// NOTE(arv): Since most of the array functions are generic it allows you to
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// pass an array-like object. Strings have a length and are considered array-
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// like. However, the 'in' operator does not work on strings so we cannot just
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// use the array path even if the browser supports indexing into strings. We
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// therefore end up splitting the string.
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/**
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* Returns the index of the first element of an array with a specified value, or
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* -1 if the element is not present in the array.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-indexof}
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*
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* @param {IArrayLike<T>|string} arr The array to be searched.
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* @param {T} obj The object for which we are searching.
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* @param {number=} opt_fromIndex The index at which to start the search. If
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* omitted the search starts at index 0.
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* @return {number} The index of the first matching array element.
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* @template T
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*/
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goog.array.indexOf = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.indexOf) ?
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function(arr, obj, opt_fromIndex) {
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goog.asserts.assert(arr.length != null);
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return Array.prototype.indexOf.call(arr, obj, opt_fromIndex);
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} :
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function(arr, obj, opt_fromIndex) {
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var fromIndex = opt_fromIndex == null ?
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0 :
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(opt_fromIndex < 0 ? Math.max(0, arr.length + opt_fromIndex) :
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opt_fromIndex);
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if (goog.isString(arr)) {
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// Array.prototype.indexOf uses === so only strings should be found.
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if (!goog.isString(obj) || obj.length != 1) {
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return -1;
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}
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return arr.indexOf(obj, fromIndex);
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}
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for (var i = fromIndex; i < arr.length; i++) {
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if (i in arr && arr[i] === obj) return i;
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}
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return -1;
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};
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/**
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* Returns the index of the last element of an array with a specified value, or
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* -1 if the element is not present in the array.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-lastindexof}
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*
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* @param {!IArrayLike<T>|string} arr The array to be searched.
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* @param {T} obj The object for which we are searching.
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* @param {?number=} opt_fromIndex The index at which to start the search. If
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* omitted the search starts at the end of the array.
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* @return {number} The index of the last matching array element.
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* @template T
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*/
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goog.array.lastIndexOf = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.lastIndexOf) ?
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function(arr, obj, opt_fromIndex) {
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goog.asserts.assert(arr.length != null);
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// Firefox treats undefined and null as 0 in the fromIndex argument which
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// leads it to always return -1
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var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;
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return Array.prototype.lastIndexOf.call(arr, obj, fromIndex);
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} :
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function(arr, obj, opt_fromIndex) {
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var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;
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if (fromIndex < 0) {
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fromIndex = Math.max(0, arr.length + fromIndex);
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}
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if (goog.isString(arr)) {
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// Array.prototype.lastIndexOf uses === so only strings should be found.
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if (!goog.isString(obj) || obj.length != 1) {
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return -1;
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}
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return arr.lastIndexOf(obj, fromIndex);
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}
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for (var i = fromIndex; i >= 0; i--) {
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if (i in arr && arr[i] === obj) return i;
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}
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return -1;
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};
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/**
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* Calls a function for each element in an array. Skips holes in the array.
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* See {@link http://tinyurl.com/developer-mozilla-org-array-foreach}
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*
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* @param {IArrayLike<T>|string} arr Array or array like object over
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* which to iterate.
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* @param {?function(this: S, T, number, ?): ?} f The function to call for every
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* element. This function takes 3 arguments (the element, the index and the
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* array). The return value is ignored.
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* @param {S=} opt_obj The object to be used as the value of 'this' within f.
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* @template T,S
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*/
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goog.array.forEach = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.forEach) ?
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function(arr, f, opt_obj) {
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goog.asserts.assert(arr.length != null);
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Array.prototype.forEach.call(arr, f, opt_obj);
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} :
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function(arr, f, opt_obj) {
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var l = arr.length; // must be fixed during loop... see docs
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var arr2 = goog.isString(arr) ? arr.split('') : arr;
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for (var i = 0; i < l; i++) {
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if (i in arr2) {
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f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);
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}
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}
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};
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/**
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* Calls a function for each element in an array, starting from the last
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* element rather than the first.
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*
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* @param {IArrayLike<T>|string} arr Array or array
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* like object over which to iterate.
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* @param {?function(this: S, T, number, ?): ?} f The function to call for every
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* element. This function
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* takes 3 arguments (the element, the index and the array). The return
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* value is ignored.
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* @param {S=} opt_obj The object to be used as the value of 'this'
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* within f.
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* @template T,S
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*/
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goog.array.forEachRight = function(arr, f, opt_obj) {
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var l = arr.length; // must be fixed during loop... see docs
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var arr2 = goog.isString(arr) ? arr.split('') : arr;
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for (var i = l - 1; i >= 0; --i) {
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if (i in arr2) {
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f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);
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}
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}
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};
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/**
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* Calls a function for each element in an array, and if the function returns
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* true adds the element to a new array.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-filter}
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*
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* @param {IArrayLike<T>|string} arr Array or array
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* like object over which to iterate.
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* @param {?function(this:S, T, number, ?):boolean} f The function to call for
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* every element. This function
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* takes 3 arguments (the element, the index and the array) and must
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* return a Boolean. If the return value is true the element is added to the
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* result array. If it is false the element is not included.
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* @param {S=} opt_obj The object to be used as the value of 'this'
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* within f.
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* @return {!Array<T>} a new array in which only elements that passed the test
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* are present.
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* @template T,S
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*/
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goog.array.filter = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.filter) ?
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function(arr, f, opt_obj) {
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goog.asserts.assert(arr.length != null);
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return Array.prototype.filter.call(arr, f, opt_obj);
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} :
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function(arr, f, opt_obj) {
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var l = arr.length; // must be fixed during loop... see docs
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var res = [];
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var resLength = 0;
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var arr2 = goog.isString(arr) ? arr.split('') : arr;
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for (var i = 0; i < l; i++) {
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if (i in arr2) {
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var val = arr2[i]; // in case f mutates arr2
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if (f.call(/** @type {?} */ (opt_obj), val, i, arr)) {
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res[resLength++] = val;
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}
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}
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}
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return res;
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};
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/**
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* Calls a function for each element in an array and inserts the result into a
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* new array.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-map}
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*
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* @param {IArrayLike<VALUE>|string} arr Array or array like object
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* over which to iterate.
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* @param {function(this:THIS, VALUE, number, ?): RESULT} f The function to call
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* for every element. This function takes 3 arguments (the element,
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* the index and the array) and should return something. The result will be
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* inserted into a new array.
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* @param {THIS=} opt_obj The object to be used as the value of 'this' within f.
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* @return {!Array<RESULT>} a new array with the results from f.
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* @template THIS, VALUE, RESULT
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*/
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goog.array.map = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.map) ?
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function(arr, f, opt_obj) {
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goog.asserts.assert(arr.length != null);
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return Array.prototype.map.call(arr, f, opt_obj);
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} :
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function(arr, f, opt_obj) {
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var l = arr.length; // must be fixed during loop... see docs
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var res = new Array(l);
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var arr2 = goog.isString(arr) ? arr.split('') : arr;
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for (var i = 0; i < l; i++) {
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if (i in arr2) {
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res[i] = f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);
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}
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}
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return res;
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};
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/**
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* Passes every element of an array into a function and accumulates the result.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-reduce}
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*
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* For example:
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* var a = [1, 2, 3, 4];
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* goog.array.reduce(a, function(r, v, i, arr) {return r + v;}, 0);
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* returns 10
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*
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* @param {IArrayLike<T>|string} arr Array or array
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* like object over which to iterate.
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* @param {function(this:S, R, T, number, ?) : R} f The function to call for
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* every element. This function
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* takes 4 arguments (the function's previous result or the initial value,
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* the value of the current array element, the current array index, and the
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* array itself)
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* function(previousValue, currentValue, index, array).
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* @param {?} val The initial value to pass into the function on the first call.
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* @param {S=} opt_obj The object to be used as the value of 'this'
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* within f.
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* @return {R} Result of evaluating f repeatedly across the values of the array.
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* @template T,S,R
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*/
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goog.array.reduce = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduce) ?
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function(arr, f, val, opt_obj) {
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goog.asserts.assert(arr.length != null);
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if (opt_obj) {
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f = goog.bind(f, opt_obj);
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}
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return Array.prototype.reduce.call(arr, f, val);
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} :
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function(arr, f, val, opt_obj) {
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var rval = val;
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goog.array.forEach(arr, function(val, index) {
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rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);
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});
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return rval;
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};
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/**
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* Passes every element of an array into a function and accumulates the result,
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* starting from the last element and working towards the first.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-reduceright}
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*
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* For example:
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* var a = ['a', 'b', 'c'];
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* goog.array.reduceRight(a, function(r, v, i, arr) {return r + v;}, '');
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* returns 'cba'
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*
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* @param {IArrayLike<T>|string} arr Array or array
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* like object over which to iterate.
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* @param {?function(this:S, R, T, number, ?) : R} f The function to call for
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* every element. This function
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* takes 4 arguments (the function's previous result or the initial value,
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* the value of the current array element, the current array index, and the
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* array itself)
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* function(previousValue, currentValue, index, array).
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* @param {?} val The initial value to pass into the function on the first call.
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* @param {S=} opt_obj The object to be used as the value of 'this'
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* within f.
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* @return {R} Object returned as a result of evaluating f repeatedly across the
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* values of the array.
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* @template T,S,R
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*/
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goog.array.reduceRight = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduceRight) ?
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function(arr, f, val, opt_obj) {
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goog.asserts.assert(arr.length != null);
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goog.asserts.assert(f != null);
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if (opt_obj) {
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f = goog.bind(f, opt_obj);
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}
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return Array.prototype.reduceRight.call(arr, f, val);
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} :
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function(arr, f, val, opt_obj) {
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var rval = val;
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goog.array.forEachRight(arr, function(val, index) {
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rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);
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});
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return rval;
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};
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/**
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* Calls f for each element of an array. If any call returns true, some()
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* returns true (without checking the remaining elements). If all calls
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* return false, some() returns false.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-some}
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*
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* @param {IArrayLike<T>|string} arr Array or array
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* like object over which to iterate.
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* @param {?function(this:S, T, number, ?) : boolean} f The function to call for
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* for every element. This function takes 3 arguments (the element, the
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* index and the array) and should return a boolean.
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* @param {S=} opt_obj The object to be used as the value of 'this'
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* within f.
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* @return {boolean} true if any element passes the test.
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* @template T,S
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*/
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goog.array.some = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.some) ?
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function(arr, f, opt_obj) {
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goog.asserts.assert(arr.length != null);
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return Array.prototype.some.call(arr, f, opt_obj);
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} :
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function(arr, f, opt_obj) {
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var l = arr.length; // must be fixed during loop... see docs
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var arr2 = goog.isString(arr) ? arr.split('') : arr;
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for (var i = 0; i < l; i++) {
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if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
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return true;
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}
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}
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return false;
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};
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/**
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* Call f for each element of an array. If all calls return true, every()
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* returns true. If any call returns false, every() returns false and
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* does not continue to check the remaining elements.
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*
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* See {@link http://tinyurl.com/developer-mozilla-org-array-every}
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*
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* @param {IArrayLike<T>|string} arr Array or array
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* like object over which to iterate.
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* @param {?function(this:S, T, number, ?) : boolean} f The function to call for
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* for every element. This function takes 3 arguments (the element, the
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* index and the array) and should return a boolean.
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* @param {S=} opt_obj The object to be used as the value of 'this'
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* within f.
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* @return {boolean} false if any element fails the test.
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* @template T,S
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*/
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goog.array.every = goog.NATIVE_ARRAY_PROTOTYPES &&
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(goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.every) ?
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function(arr, f, opt_obj) {
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goog.asserts.assert(arr.length != null);
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return Array.prototype.every.call(arr, f, opt_obj);
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} :
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function(arr, f, opt_obj) {
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var l = arr.length; // must be fixed during loop... see docs
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var arr2 = goog.isString(arr) ? arr.split('') : arr;
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for (var i = 0; i < l; i++) {
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if (i in arr2 && !f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
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return false;
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}
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}
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return true;
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};
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|
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/**
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* Counts the array elements that fulfill the predicate, i.e. for which the
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* callback function returns true. Skips holes in the array.
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*
|
|
* @param {!IArrayLike<T>|string} arr Array or array like object
|
|
* over which to iterate.
|
|
* @param {function(this: S, T, number, ?): boolean} f The function to call for
|
|
* every element. Takes 3 arguments (the element, the index and the array).
|
|
* @param {S=} opt_obj The object to be used as the value of 'this' within f.
|
|
* @return {number} The number of the matching elements.
|
|
* @template T,S
|
|
*/
|
|
goog.array.count = function(arr, f, opt_obj) {
|
|
var count = 0;
|
|
goog.array.forEach(arr, function(element, index, arr) {
|
|
if (f.call(/** @type {?} */ (opt_obj), element, index, arr)) {
|
|
++count;
|
|
}
|
|
}, opt_obj);
|
|
return count;
|
|
};
|
|
|
|
|
|
/**
|
|
* Search an array for the first element that satisfies a given condition and
|
|
* return that element.
|
|
* @param {IArrayLike<T>|string} arr Array or array
|
|
* like object over which to iterate.
|
|
* @param {?function(this:S, T, number, ?) : boolean} f The function to call
|
|
* for every element. This function takes 3 arguments (the element, the
|
|
* index and the array) and should return a boolean.
|
|
* @param {S=} opt_obj An optional "this" context for the function.
|
|
* @return {T|null} The first array element that passes the test, or null if no
|
|
* element is found.
|
|
* @template T,S
|
|
*/
|
|
goog.array.find = function(arr, f, opt_obj) {
|
|
var i = goog.array.findIndex(arr, f, opt_obj);
|
|
return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];
|
|
};
|
|
|
|
|
|
/**
|
|
* Search an array for the first element that satisfies a given condition and
|
|
* return its index.
|
|
* @param {IArrayLike<T>|string} arr Array or array
|
|
* like object over which to iterate.
|
|
* @param {?function(this:S, T, number, ?) : boolean} f The function to call for
|
|
* every element. This function
|
|
* takes 3 arguments (the element, the index and the array) and should
|
|
* return a boolean.
|
|
* @param {S=} opt_obj An optional "this" context for the function.
|
|
* @return {number} The index of the first array element that passes the test,
|
|
* or -1 if no element is found.
|
|
* @template T,S
|
|
*/
|
|
goog.array.findIndex = function(arr, f, opt_obj) {
|
|
var l = arr.length; // must be fixed during loop... see docs
|
|
var arr2 = goog.isString(arr) ? arr.split('') : arr;
|
|
for (var i = 0; i < l; i++) {
|
|
if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
};
|
|
|
|
|
|
/**
|
|
* Search an array (in reverse order) for the last element that satisfies a
|
|
* given condition and return that element.
|
|
* @param {IArrayLike<T>|string} arr Array or array
|
|
* like object over which to iterate.
|
|
* @param {?function(this:S, T, number, ?) : boolean} f The function to call
|
|
* for every element. This function
|
|
* takes 3 arguments (the element, the index and the array) and should
|
|
* return a boolean.
|
|
* @param {S=} opt_obj An optional "this" context for the function.
|
|
* @return {T|null} The last array element that passes the test, or null if no
|
|
* element is found.
|
|
* @template T,S
|
|
*/
|
|
goog.array.findRight = function(arr, f, opt_obj) {
|
|
var i = goog.array.findIndexRight(arr, f, opt_obj);
|
|
return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];
|
|
};
|
|
|
|
|
|
/**
|
|
* Search an array (in reverse order) for the last element that satisfies a
|
|
* given condition and return its index.
|
|
* @param {IArrayLike<T>|string} arr Array or array
|
|
* like object over which to iterate.
|
|
* @param {?function(this:S, T, number, ?) : boolean} f The function to call
|
|
* for every element. This function
|
|
* takes 3 arguments (the element, the index and the array) and should
|
|
* return a boolean.
|
|
* @param {S=} opt_obj An optional "this" context for the function.
|
|
* @return {number} The index of the last array element that passes the test,
|
|
* or -1 if no element is found.
|
|
* @template T,S
|
|
*/
|
|
goog.array.findIndexRight = function(arr, f, opt_obj) {
|
|
var l = arr.length; // must be fixed during loop... see docs
|
|
var arr2 = goog.isString(arr) ? arr.split('') : arr;
|
|
for (var i = l - 1; i >= 0; i--) {
|
|
if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
};
|
|
|
|
|
|
/**
|
|
* Whether the array contains the given object.
|
|
* @param {IArrayLike<?>|string} arr The array to test for the presence of the
|
|
* element.
|
|
* @param {*} obj The object for which to test.
|
|
* @return {boolean} true if obj is present.
|
|
*/
|
|
goog.array.contains = function(arr, obj) {
|
|
return goog.array.indexOf(arr, obj) >= 0;
|
|
};
|
|
|
|
|
|
/**
|
|
* Whether the array is empty.
|
|
* @param {IArrayLike<?>|string} arr The array to test.
|
|
* @return {boolean} true if empty.
|
|
*/
|
|
goog.array.isEmpty = function(arr) {
|
|
return arr.length == 0;
|
|
};
|
|
|
|
|
|
/**
|
|
* Clears the array.
|
|
* @param {IArrayLike<?>} arr Array or array like object to clear.
|
|
*/
|
|
goog.array.clear = function(arr) {
|
|
// For non real arrays we don't have the magic length so we delete the
|
|
// indices.
|
|
if (!goog.isArray(arr)) {
|
|
for (var i = arr.length - 1; i >= 0; i--) {
|
|
delete arr[i];
|
|
}
|
|
}
|
|
arr.length = 0;
|
|
};
|
|
|
|
|
|
/**
|
|
* Pushes an item into an array, if it's not already in the array.
|
|
* @param {Array<T>} arr Array into which to insert the item.
|
|
* @param {T} obj Value to add.
|
|
* @template T
|
|
*/
|
|
goog.array.insert = function(arr, obj) {
|
|
if (!goog.array.contains(arr, obj)) {
|
|
arr.push(obj);
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Inserts an object at the given index of the array.
|
|
* @param {IArrayLike<?>} arr The array to modify.
|
|
* @param {*} obj The object to insert.
|
|
* @param {number=} opt_i The index at which to insert the object. If omitted,
|
|
* treated as 0. A negative index is counted from the end of the array.
|
|
*/
|
|
goog.array.insertAt = function(arr, obj, opt_i) {
|
|
goog.array.splice(arr, opt_i, 0, obj);
|
|
};
|
|
|
|
|
|
/**
|
|
* Inserts at the given index of the array, all elements of another array.
|
|
* @param {IArrayLike<?>} arr The array to modify.
|
|
* @param {IArrayLike<?>} elementsToAdd The array of elements to add.
|
|
* @param {number=} opt_i The index at which to insert the object. If omitted,
|
|
* treated as 0. A negative index is counted from the end of the array.
|
|
*/
|
|
goog.array.insertArrayAt = function(arr, elementsToAdd, opt_i) {
|
|
goog.partial(goog.array.splice, arr, opt_i, 0).apply(null, elementsToAdd);
|
|
};
|
|
|
|
|
|
/**
|
|
* Inserts an object into an array before a specified object.
|
|
* @param {Array<T>} arr The array to modify.
|
|
* @param {T} obj The object to insert.
|
|
* @param {T=} opt_obj2 The object before which obj should be inserted. If obj2
|
|
* is omitted or not found, obj is inserted at the end of the array.
|
|
* @template T
|
|
*/
|
|
goog.array.insertBefore = function(arr, obj, opt_obj2) {
|
|
var i;
|
|
if (arguments.length == 2 || (i = goog.array.indexOf(arr, opt_obj2)) < 0) {
|
|
arr.push(obj);
|
|
} else {
|
|
goog.array.insertAt(arr, obj, i);
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Removes the first occurrence of a particular value from an array.
|
|
* @param {IArrayLike<T>} arr Array from which to remove
|
|
* value.
|
|
* @param {T} obj Object to remove.
|
|
* @return {boolean} True if an element was removed.
|
|
* @template T
|
|
*/
|
|
goog.array.remove = function(arr, obj) {
|
|
var i = goog.array.indexOf(arr, obj);
|
|
var rv;
|
|
if ((rv = i >= 0)) {
|
|
goog.array.removeAt(arr, i);
|
|
}
|
|
return rv;
|
|
};
|
|
|
|
|
|
/**
|
|
* Removes the last occurrence of a particular value from an array.
|
|
* @param {!IArrayLike<T>} arr Array from which to remove value.
|
|
* @param {T} obj Object to remove.
|
|
* @return {boolean} True if an element was removed.
|
|
* @template T
|
|
*/
|
|
goog.array.removeLast = function(arr, obj) {
|
|
var i = goog.array.lastIndexOf(arr, obj);
|
|
if (i >= 0) {
|
|
goog.array.removeAt(arr, i);
|
|
return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
|
|
/**
|
|
* Removes from an array the element at index i
|
|
* @param {IArrayLike<?>} arr Array or array like object from which to
|
|
* remove value.
|
|
* @param {number} i The index to remove.
|
|
* @return {boolean} True if an element was removed.
|
|
*/
|
|
goog.array.removeAt = function(arr, i) {
|
|
goog.asserts.assert(arr.length != null);
|
|
|
|
// use generic form of splice
|
|
// splice returns the removed items and if successful the length of that
|
|
// will be 1
|
|
return Array.prototype.splice.call(arr, i, 1).length == 1;
|
|
};
|
|
|
|
|
|
/**
|
|
* Removes the first value that satisfies the given condition.
|
|
* @param {IArrayLike<T>} arr Array or array
|
|
* like object over which to iterate.
|
|
* @param {?function(this:S, T, number, ?) : boolean} f The function to call
|
|
* for every element. This function
|
|
* takes 3 arguments (the element, the index and the array) and should
|
|
* return a boolean.
|
|
* @param {S=} opt_obj An optional "this" context for the function.
|
|
* @return {boolean} True if an element was removed.
|
|
* @template T,S
|
|
*/
|
|
goog.array.removeIf = function(arr, f, opt_obj) {
|
|
var i = goog.array.findIndex(arr, f, opt_obj);
|
|
if (i >= 0) {
|
|
goog.array.removeAt(arr, i);
|
|
return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
|
|
/**
|
|
* Removes all values that satisfy the given condition.
|
|
* @param {IArrayLike<T>} arr Array or array
|
|
* like object over which to iterate.
|
|
* @param {?function(this:S, T, number, ?) : boolean} f The function to call
|
|
* for every element. This function
|
|
* takes 3 arguments (the element, the index and the array) and should
|
|
* return a boolean.
|
|
* @param {S=} opt_obj An optional "this" context for the function.
|
|
* @return {number} The number of items removed
|
|
* @template T,S
|
|
*/
|
|
goog.array.removeAllIf = function(arr, f, opt_obj) {
|
|
var removedCount = 0;
|
|
goog.array.forEachRight(arr, function(val, index) {
|
|
if (f.call(/** @type {?} */ (opt_obj), val, index, arr)) {
|
|
if (goog.array.removeAt(arr, index)) {
|
|
removedCount++;
|
|
}
|
|
}
|
|
});
|
|
return removedCount;
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns a new array that is the result of joining the arguments. If arrays
|
|
* are passed then their items are added, however, if non-arrays are passed they
|
|
* will be added to the return array as is.
|
|
*
|
|
* Note that ArrayLike objects will be added as is, rather than having their
|
|
* items added.
|
|
*
|
|
* goog.array.concat([1, 2], [3, 4]) -> [1, 2, 3, 4]
|
|
* goog.array.concat(0, [1, 2]) -> [0, 1, 2]
|
|
* goog.array.concat([1, 2], null) -> [1, 2, null]
|
|
*
|
|
* There is bug in all current versions of IE (6, 7 and 8) where arrays created
|
|
* in an iframe become corrupted soon (not immediately) after the iframe is
|
|
* destroyed. This is common if loading data via goog.net.IframeIo, for example.
|
|
* This corruption only affects the concat method which will start throwing
|
|
* Catastrophic Errors (#-2147418113).
|
|
*
|
|
* See http://endoflow.com/scratch/corrupted-arrays.html for a test case.
|
|
*
|
|
* Internally goog.array should use this, so that all methods will continue to
|
|
* work on these broken array objects.
|
|
*
|
|
* @param {...*} var_args Items to concatenate. Arrays will have each item
|
|
* added, while primitives and objects will be added as is.
|
|
* @return {!Array<?>} The new resultant array.
|
|
*/
|
|
goog.array.concat = function(var_args) {
|
|
return Array.prototype.concat.apply(Array.prototype, arguments);
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns a new array that contains the contents of all the arrays passed.
|
|
* @param {...!Array<T>} var_args
|
|
* @return {!Array<T>}
|
|
* @template T
|
|
*/
|
|
goog.array.join = function(var_args) {
|
|
return Array.prototype.concat.apply(Array.prototype, arguments);
|
|
};
|
|
|
|
|
|
/**
|
|
* Converts an object to an array.
|
|
* @param {IArrayLike<T>|string} object The object to convert to an
|
|
* array.
|
|
* @return {!Array<T>} The object converted into an array. If object has a
|
|
* length property, every property indexed with a non-negative number
|
|
* less than length will be included in the result. If object does not
|
|
* have a length property, an empty array will be returned.
|
|
* @template T
|
|
*/
|
|
goog.array.toArray = function(object) {
|
|
var length = object.length;
|
|
|
|
// If length is not a number the following it false. This case is kept for
|
|
// backwards compatibility since there are callers that pass objects that are
|
|
// not array like.
|
|
if (length > 0) {
|
|
var rv = new Array(length);
|
|
for (var i = 0; i < length; i++) {
|
|
rv[i] = object[i];
|
|
}
|
|
return rv;
|
|
}
|
|
return [];
|
|
};
|
|
|
|
|
|
/**
|
|
* Does a shallow copy of an array.
|
|
* @param {IArrayLike<T>|string} arr Array or array-like object to
|
|
* clone.
|
|
* @return {!Array<T>} Clone of the input array.
|
|
* @template T
|
|
*/
|
|
goog.array.clone = goog.array.toArray;
|
|
|
|
|
|
/**
|
|
* Extends an array with another array, element, or "array like" object.
|
|
* This function operates 'in-place', it does not create a new Array.
|
|
*
|
|
* Example:
|
|
* var a = [];
|
|
* goog.array.extend(a, [0, 1]);
|
|
* a; // [0, 1]
|
|
* goog.array.extend(a, 2);
|
|
* a; // [0, 1, 2]
|
|
*
|
|
* @param {Array<VALUE>} arr1 The array to modify.
|
|
* @param {...(Array<VALUE>|VALUE)} var_args The elements or arrays of elements
|
|
* to add to arr1.
|
|
* @template VALUE
|
|
*/
|
|
goog.array.extend = function(arr1, var_args) {
|
|
for (var i = 1; i < arguments.length; i++) {
|
|
var arr2 = arguments[i];
|
|
if (goog.isArrayLike(arr2)) {
|
|
var len1 = arr1.length || 0;
|
|
var len2 = arr2.length || 0;
|
|
arr1.length = len1 + len2;
|
|
for (var j = 0; j < len2; j++) {
|
|
arr1[len1 + j] = arr2[j];
|
|
}
|
|
} else {
|
|
arr1.push(arr2);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Adds or removes elements from an array. This is a generic version of Array
|
|
* splice. This means that it might work on other objects similar to arrays,
|
|
* such as the arguments object.
|
|
*
|
|
* @param {IArrayLike<T>} arr The array to modify.
|
|
* @param {number|undefined} index The index at which to start changing the
|
|
* array. If not defined, treated as 0.
|
|
* @param {number} howMany How many elements to remove (0 means no removal. A
|
|
* value below 0 is treated as zero and so is any other non number. Numbers
|
|
* are floored).
|
|
* @param {...T} var_args Optional, additional elements to insert into the
|
|
* array.
|
|
* @return {!Array<T>} the removed elements.
|
|
* @template T
|
|
*/
|
|
goog.array.splice = function(arr, index, howMany, var_args) {
|
|
goog.asserts.assert(arr.length != null);
|
|
|
|
return Array.prototype.splice.apply(arr, goog.array.slice(arguments, 1));
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns a new array from a segment of an array. This is a generic version of
|
|
* Array slice. This means that it might work on other objects similar to
|
|
* arrays, such as the arguments object.
|
|
*
|
|
* @param {IArrayLike<T>|string} arr The array from
|
|
* which to copy a segment.
|
|
* @param {number} start The index of the first element to copy.
|
|
* @param {number=} opt_end The index after the last element to copy.
|
|
* @return {!Array<T>} A new array containing the specified segment of the
|
|
* original array.
|
|
* @template T
|
|
*/
|
|
goog.array.slice = function(arr, start, opt_end) {
|
|
goog.asserts.assert(arr.length != null);
|
|
|
|
// passing 1 arg to slice is not the same as passing 2 where the second is
|
|
// null or undefined (in that case the second argument is treated as 0).
|
|
// we could use slice on the arguments object and then use apply instead of
|
|
// testing the length
|
|
if (arguments.length <= 2) {
|
|
return Array.prototype.slice.call(arr, start);
|
|
} else {
|
|
return Array.prototype.slice.call(arr, start, opt_end);
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Removes all duplicates from an array (retaining only the first
|
|
* occurrence of each array element). This function modifies the
|
|
* array in place and doesn't change the order of the non-duplicate items.
|
|
*
|
|
* For objects, duplicates are identified as having the same unique ID as
|
|
* defined by {@link goog.getUid}.
|
|
*
|
|
* Alternatively you can specify a custom hash function that returns a unique
|
|
* value for each item in the array it should consider unique.
|
|
*
|
|
* Runtime: N,
|
|
* Worstcase space: 2N (no dupes)
|
|
*
|
|
* @param {IArrayLike<T>} arr The array from which to remove
|
|
* duplicates.
|
|
* @param {Array=} opt_rv An optional array in which to return the results,
|
|
* instead of performing the removal inplace. If specified, the original
|
|
* array will remain unchanged.
|
|
* @param {function(T):string=} opt_hashFn An optional function to use to
|
|
* apply to every item in the array. This function should return a unique
|
|
* value for each item in the array it should consider unique.
|
|
* @template T
|
|
*/
|
|
goog.array.removeDuplicates = function(arr, opt_rv, opt_hashFn) {
|
|
var returnArray = opt_rv || arr;
|
|
var defaultHashFn = function(item) {
|
|
// Prefix each type with a single character representing the type to
|
|
// prevent conflicting keys (e.g. true and 'true').
|
|
return goog.isObject(item) ? 'o' + goog.getUid(item) :
|
|
(typeof item).charAt(0) + item;
|
|
};
|
|
var hashFn = opt_hashFn || defaultHashFn;
|
|
|
|
var seen = {}, cursorInsert = 0, cursorRead = 0;
|
|
while (cursorRead < arr.length) {
|
|
var current = arr[cursorRead++];
|
|
var key = hashFn(current);
|
|
if (!Object.prototype.hasOwnProperty.call(seen, key)) {
|
|
seen[key] = true;
|
|
returnArray[cursorInsert++] = current;
|
|
}
|
|
}
|
|
returnArray.length = cursorInsert;
|
|
};
|
|
|
|
|
|
/**
|
|
* Searches the specified array for the specified target using the binary
|
|
* search algorithm. If no opt_compareFn is specified, elements are compared
|
|
* using <code>goog.array.defaultCompare</code>, which compares the elements
|
|
* using the built in < and > operators. This will produce the expected
|
|
* behavior for homogeneous arrays of String(s) and Number(s). The array
|
|
* specified <b>must</b> be sorted in ascending order (as defined by the
|
|
* comparison function). If the array is not sorted, results are undefined.
|
|
* If the array contains multiple instances of the specified target value, any
|
|
* of these instances may be found.
|
|
*
|
|
* Runtime: O(log n)
|
|
*
|
|
* @param {IArrayLike<VALUE>} arr The array to be searched.
|
|
* @param {TARGET} target The sought value.
|
|
* @param {function(TARGET, VALUE): number=} opt_compareFn Optional comparison
|
|
* function by which the array is ordered. Should take 2 arguments to
|
|
* compare, and return a negative number, zero, or a positive number
|
|
* depending on whether the first argument is less than, equal to, or
|
|
* greater than the second.
|
|
* @return {number} Lowest index of the target value if found, otherwise
|
|
* (-(insertion point) - 1). The insertion point is where the value should
|
|
* be inserted into arr to preserve the sorted property. Return value >= 0
|
|
* iff target is found.
|
|
* @template TARGET, VALUE
|
|
*/
|
|
goog.array.binarySearch = function(arr, target, opt_compareFn) {
|
|
return goog.array.binarySearch_(
|
|
arr, opt_compareFn || goog.array.defaultCompare, false /* isEvaluator */,
|
|
target);
|
|
};
|
|
|
|
|
|
/**
|
|
* Selects an index in the specified array using the binary search algorithm.
|
|
* The evaluator receives an element and determines whether the desired index
|
|
* is before, at, or after it. The evaluator must be consistent (formally,
|
|
* goog.array.map(goog.array.map(arr, evaluator, opt_obj), goog.math.sign)
|
|
* must be monotonically non-increasing).
|
|
*
|
|
* Runtime: O(log n)
|
|
*
|
|
* @param {IArrayLike<VALUE>} arr The array to be searched.
|
|
* @param {function(this:THIS, VALUE, number, ?): number} evaluator
|
|
* Evaluator function that receives 3 arguments (the element, the index and
|
|
* the array). Should return a negative number, zero, or a positive number
|
|
* depending on whether the desired index is before, at, or after the
|
|
* element passed to it.
|
|
* @param {THIS=} opt_obj The object to be used as the value of 'this'
|
|
* within evaluator.
|
|
* @return {number} Index of the leftmost element matched by the evaluator, if
|
|
* such exists; otherwise (-(insertion point) - 1). The insertion point is
|
|
* the index of the first element for which the evaluator returns negative,
|
|
* or arr.length if no such element exists. The return value is non-negative
|
|
* iff a match is found.
|
|
* @template THIS, VALUE
|
|
*/
|
|
goog.array.binarySelect = function(arr, evaluator, opt_obj) {
|
|
return goog.array.binarySearch_(
|
|
arr, evaluator, true /* isEvaluator */, undefined /* opt_target */,
|
|
opt_obj);
|
|
};
|
|
|
|
|
|
/**
|
|
* Implementation of a binary search algorithm which knows how to use both
|
|
* comparison functions and evaluators. If an evaluator is provided, will call
|
|
* the evaluator with the given optional data object, conforming to the
|
|
* interface defined in binarySelect. Otherwise, if a comparison function is
|
|
* provided, will call the comparison function against the given data object.
|
|
*
|
|
* This implementation purposefully does not use goog.bind or goog.partial for
|
|
* performance reasons.
|
|
*
|
|
* Runtime: O(log n)
|
|
*
|
|
* @param {IArrayLike<?>} arr The array to be searched.
|
|
* @param {function(?, ?, ?): number | function(?, ?): number} compareFn
|
|
* Either an evaluator or a comparison function, as defined by binarySearch
|
|
* and binarySelect above.
|
|
* @param {boolean} isEvaluator Whether the function is an evaluator or a
|
|
* comparison function.
|
|
* @param {?=} opt_target If the function is a comparison function, then
|
|
* this is the target to binary search for.
|
|
* @param {Object=} opt_selfObj If the function is an evaluator, this is an
|
|
* optional this object for the evaluator.
|
|
* @return {number} Lowest index of the target value if found, otherwise
|
|
* (-(insertion point) - 1). The insertion point is where the value should
|
|
* be inserted into arr to preserve the sorted property. Return value >= 0
|
|
* iff target is found.
|
|
* @private
|
|
*/
|
|
goog.array.binarySearch_ = function(
|
|
arr, compareFn, isEvaluator, opt_target, opt_selfObj) {
|
|
var left = 0; // inclusive
|
|
var right = arr.length; // exclusive
|
|
var found;
|
|
while (left < right) {
|
|
var middle = (left + right) >> 1;
|
|
var compareResult;
|
|
if (isEvaluator) {
|
|
compareResult = compareFn.call(opt_selfObj, arr[middle], middle, arr);
|
|
} else {
|
|
// NOTE(dimvar): To avoid this cast, we'd have to use function overloading
|
|
// for the type of binarySearch_, which the type system can't express yet.
|
|
compareResult = /** @type {function(?, ?): number} */ (compareFn)(
|
|
opt_target, arr[middle]);
|
|
}
|
|
if (compareResult > 0) {
|
|
left = middle + 1;
|
|
} else {
|
|
right = middle;
|
|
// We are looking for the lowest index so we can't return immediately.
|
|
found = !compareResult;
|
|
}
|
|
}
|
|
// left is the index if found, or the insertion point otherwise.
|
|
// ~left is a shorthand for -left - 1.
|
|
return found ? left : ~left;
|
|
};
|
|
|
|
|
|
/**
|
|
* Sorts the specified array into ascending order. If no opt_compareFn is
|
|
* specified, elements are compared using
|
|
* <code>goog.array.defaultCompare</code>, which compares the elements using
|
|
* the built in < and > operators. This will produce the expected behavior
|
|
* for homogeneous arrays of String(s) and Number(s), unlike the native sort,
|
|
* but will give unpredictable results for heterogeneous lists of strings and
|
|
* numbers with different numbers of digits.
|
|
*
|
|
* This sort is not guaranteed to be stable.
|
|
*
|
|
* Runtime: Same as <code>Array.prototype.sort</code>
|
|
*
|
|
* @param {Array<T>} arr The array to be sorted.
|
|
* @param {?function(T,T):number=} opt_compareFn Optional comparison
|
|
* function by which the
|
|
* array is to be ordered. Should take 2 arguments to compare, and return a
|
|
* negative number, zero, or a positive number depending on whether the
|
|
* first argument is less than, equal to, or greater than the second.
|
|
* @template T
|
|
*/
|
|
goog.array.sort = function(arr, opt_compareFn) {
|
|
// TODO(arv): Update type annotation since null is not accepted.
|
|
arr.sort(opt_compareFn || goog.array.defaultCompare);
|
|
};
|
|
|
|
|
|
/**
|
|
* Sorts the specified array into ascending order in a stable way. If no
|
|
* opt_compareFn is specified, elements are compared using
|
|
* <code>goog.array.defaultCompare</code>, which compares the elements using
|
|
* the built in < and > operators. This will produce the expected behavior
|
|
* for homogeneous arrays of String(s) and Number(s).
|
|
*
|
|
* Runtime: Same as <code>Array.prototype.sort</code>, plus an additional
|
|
* O(n) overhead of copying the array twice.
|
|
*
|
|
* @param {Array<T>} arr The array to be sorted.
|
|
* @param {?function(T, T): number=} opt_compareFn Optional comparison function
|
|
* by which the array is to be ordered. Should take 2 arguments to compare,
|
|
* and return a negative number, zero, or a positive number depending on
|
|
* whether the first argument is less than, equal to, or greater than the
|
|
* second.
|
|
* @template T
|
|
*/
|
|
goog.array.stableSort = function(arr, opt_compareFn) {
|
|
var compArr = new Array(arr.length);
|
|
for (var i = 0; i < arr.length; i++) {
|
|
compArr[i] = {index: i, value: arr[i]};
|
|
}
|
|
var valueCompareFn = opt_compareFn || goog.array.defaultCompare;
|
|
function stableCompareFn(obj1, obj2) {
|
|
return valueCompareFn(obj1.value, obj2.value) || obj1.index - obj2.index;
|
|
}
|
|
goog.array.sort(compArr, stableCompareFn);
|
|
for (var i = 0; i < arr.length; i++) {
|
|
arr[i] = compArr[i].value;
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Sort the specified array into ascending order based on item keys
|
|
* returned by the specified key function.
|
|
* If no opt_compareFn is specified, the keys are compared in ascending order
|
|
* using <code>goog.array.defaultCompare</code>.
|
|
*
|
|
* Runtime: O(S(f(n)), where S is runtime of <code>goog.array.sort</code>
|
|
* and f(n) is runtime of the key function.
|
|
*
|
|
* @param {Array<T>} arr The array to be sorted.
|
|
* @param {function(T): K} keyFn Function taking array element and returning
|
|
* a key used for sorting this element.
|
|
* @param {?function(K, K): number=} opt_compareFn Optional comparison function
|
|
* by which the keys are to be ordered. Should take 2 arguments to compare,
|
|
* and return a negative number, zero, or a positive number depending on
|
|
* whether the first argument is less than, equal to, or greater than the
|
|
* second.
|
|
* @template T,K
|
|
*/
|
|
goog.array.sortByKey = function(arr, keyFn, opt_compareFn) {
|
|
var keyCompareFn = opt_compareFn || goog.array.defaultCompare;
|
|
goog.array.sort(
|
|
arr, function(a, b) { return keyCompareFn(keyFn(a), keyFn(b)); });
|
|
};
|
|
|
|
|
|
/**
|
|
* Sorts an array of objects by the specified object key and compare
|
|
* function. If no compare function is provided, the key values are
|
|
* compared in ascending order using <code>goog.array.defaultCompare</code>.
|
|
* This won't work for keys that get renamed by the compiler. So use
|
|
* {'foo': 1, 'bar': 2} rather than {foo: 1, bar: 2}.
|
|
* @param {Array<Object>} arr An array of objects to sort.
|
|
* @param {string} key The object key to sort by.
|
|
* @param {Function=} opt_compareFn The function to use to compare key
|
|
* values.
|
|
*/
|
|
goog.array.sortObjectsByKey = function(arr, key, opt_compareFn) {
|
|
goog.array.sortByKey(arr, function(obj) { return obj[key]; }, opt_compareFn);
|
|
};
|
|
|
|
|
|
/**
|
|
* Tells if the array is sorted.
|
|
* @param {!Array<T>} arr The array.
|
|
* @param {?function(T,T):number=} opt_compareFn Function to compare the
|
|
* array elements.
|
|
* Should take 2 arguments to compare, and return a negative number, zero,
|
|
* or a positive number depending on whether the first argument is less
|
|
* than, equal to, or greater than the second.
|
|
* @param {boolean=} opt_strict If true no equal elements are allowed.
|
|
* @return {boolean} Whether the array is sorted.
|
|
* @template T
|
|
*/
|
|
goog.array.isSorted = function(arr, opt_compareFn, opt_strict) {
|
|
var compare = opt_compareFn || goog.array.defaultCompare;
|
|
for (var i = 1; i < arr.length; i++) {
|
|
var compareResult = compare(arr[i - 1], arr[i]);
|
|
if (compareResult > 0 || compareResult == 0 && opt_strict) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
};
|
|
|
|
|
|
/**
|
|
* Compares two arrays for equality. Two arrays are considered equal if they
|
|
* have the same length and their corresponding elements are equal according to
|
|
* the comparison function.
|
|
*
|
|
* @param {IArrayLike<?>} arr1 The first array to compare.
|
|
* @param {IArrayLike<?>} arr2 The second array to compare.
|
|
* @param {Function=} opt_equalsFn Optional comparison function.
|
|
* Should take 2 arguments to compare, and return true if the arguments
|
|
* are equal. Defaults to {@link goog.array.defaultCompareEquality} which
|
|
* compares the elements using the built-in '===' operator.
|
|
* @return {boolean} Whether the two arrays are equal.
|
|
*/
|
|
goog.array.equals = function(arr1, arr2, opt_equalsFn) {
|
|
if (!goog.isArrayLike(arr1) || !goog.isArrayLike(arr2) ||
|
|
arr1.length != arr2.length) {
|
|
return false;
|
|
}
|
|
var l = arr1.length;
|
|
var equalsFn = opt_equalsFn || goog.array.defaultCompareEquality;
|
|
for (var i = 0; i < l; i++) {
|
|
if (!equalsFn(arr1[i], arr2[i])) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
};
|
|
|
|
|
|
/**
|
|
* 3-way array compare function.
|
|
* @param {!IArrayLike<VALUE>} arr1 The first array to
|
|
* compare.
|
|
* @param {!IArrayLike<VALUE>} arr2 The second array to
|
|
* compare.
|
|
* @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
|
|
* function by which the array is to be ordered. Should take 2 arguments to
|
|
* compare, and return a negative number, zero, or a positive number
|
|
* depending on whether the first argument is less than, equal to, or
|
|
* greater than the second.
|
|
* @return {number} Negative number, zero, or a positive number depending on
|
|
* whether the first argument is less than, equal to, or greater than the
|
|
* second.
|
|
* @template VALUE
|
|
*/
|
|
goog.array.compare3 = function(arr1, arr2, opt_compareFn) {
|
|
var compare = opt_compareFn || goog.array.defaultCompare;
|
|
var l = Math.min(arr1.length, arr2.length);
|
|
for (var i = 0; i < l; i++) {
|
|
var result = compare(arr1[i], arr2[i]);
|
|
if (result != 0) {
|
|
return result;
|
|
}
|
|
}
|
|
return goog.array.defaultCompare(arr1.length, arr2.length);
|
|
};
|
|
|
|
|
|
/**
|
|
* Compares its two arguments for order, using the built in < and >
|
|
* operators.
|
|
* @param {VALUE} a The first object to be compared.
|
|
* @param {VALUE} b The second object to be compared.
|
|
* @return {number} A negative number, zero, or a positive number as the first
|
|
* argument is less than, equal to, or greater than the second,
|
|
* respectively.
|
|
* @template VALUE
|
|
*/
|
|
goog.array.defaultCompare = function(a, b) {
|
|
return a > b ? 1 : a < b ? -1 : 0;
|
|
};
|
|
|
|
|
|
/**
|
|
* Compares its two arguments for inverse order, using the built in < and >
|
|
* operators.
|
|
* @param {VALUE} a The first object to be compared.
|
|
* @param {VALUE} b The second object to be compared.
|
|
* @return {number} A negative number, zero, or a positive number as the first
|
|
* argument is greater than, equal to, or less than the second,
|
|
* respectively.
|
|
* @template VALUE
|
|
*/
|
|
goog.array.inverseDefaultCompare = function(a, b) {
|
|
return -goog.array.defaultCompare(a, b);
|
|
};
|
|
|
|
|
|
/**
|
|
* Compares its two arguments for equality, using the built in === operator.
|
|
* @param {*} a The first object to compare.
|
|
* @param {*} b The second object to compare.
|
|
* @return {boolean} True if the two arguments are equal, false otherwise.
|
|
*/
|
|
goog.array.defaultCompareEquality = function(a, b) {
|
|
return a === b;
|
|
};
|
|
|
|
|
|
/**
|
|
* Inserts a value into a sorted array. The array is not modified if the
|
|
* value is already present.
|
|
* @param {IArrayLike<VALUE>} array The array to modify.
|
|
* @param {VALUE} value The object to insert.
|
|
* @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
|
|
* function by which the array is ordered. Should take 2 arguments to
|
|
* compare, and return a negative number, zero, or a positive number
|
|
* depending on whether the first argument is less than, equal to, or
|
|
* greater than the second.
|
|
* @return {boolean} True if an element was inserted.
|
|
* @template VALUE
|
|
*/
|
|
goog.array.binaryInsert = function(array, value, opt_compareFn) {
|
|
var index = goog.array.binarySearch(array, value, opt_compareFn);
|
|
if (index < 0) {
|
|
goog.array.insertAt(array, value, -(index + 1));
|
|
return true;
|
|
}
|
|
return false;
|
|
};
|
|
|
|
|
|
/**
|
|
* Removes a value from a sorted array.
|
|
* @param {!IArrayLike<VALUE>} array The array to modify.
|
|
* @param {VALUE} value The object to remove.
|
|
* @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
|
|
* function by which the array is ordered. Should take 2 arguments to
|
|
* compare, and return a negative number, zero, or a positive number
|
|
* depending on whether the first argument is less than, equal to, or
|
|
* greater than the second.
|
|
* @return {boolean} True if an element was removed.
|
|
* @template VALUE
|
|
*/
|
|
goog.array.binaryRemove = function(array, value, opt_compareFn) {
|
|
var index = goog.array.binarySearch(array, value, opt_compareFn);
|
|
return (index >= 0) ? goog.array.removeAt(array, index) : false;
|
|
};
|
|
|
|
|
|
/**
|
|
* Splits an array into disjoint buckets according to a splitting function.
|
|
* @param {Array<T>} array The array.
|
|
* @param {function(this:S, T,number,Array<T>):?} sorter Function to call for
|
|
* every element. This takes 3 arguments (the element, the index and the
|
|
* array) and must return a valid object key (a string, number, etc), or
|
|
* undefined, if that object should not be placed in a bucket.
|
|
* @param {S=} opt_obj The object to be used as the value of 'this' within
|
|
* sorter.
|
|
* @return {!Object} An object, with keys being all of the unique return values
|
|
* of sorter, and values being arrays containing the items for
|
|
* which the splitter returned that key.
|
|
* @template T,S
|
|
*/
|
|
goog.array.bucket = function(array, sorter, opt_obj) {
|
|
var buckets = {};
|
|
|
|
for (var i = 0; i < array.length; i++) {
|
|
var value = array[i];
|
|
var key = sorter.call(/** @type {?} */ (opt_obj), value, i, array);
|
|
if (goog.isDef(key)) {
|
|
// Push the value to the right bucket, creating it if necessary.
|
|
var bucket = buckets[key] || (buckets[key] = []);
|
|
bucket.push(value);
|
|
}
|
|
}
|
|
|
|
return buckets;
|
|
};
|
|
|
|
|
|
/**
|
|
* Creates a new object built from the provided array and the key-generation
|
|
* function.
|
|
* @param {IArrayLike<T>} arr Array or array like object over
|
|
* which to iterate whose elements will be the values in the new object.
|
|
* @param {?function(this:S, T, number, ?) : string} keyFunc The function to
|
|
* call for every element. This function takes 3 arguments (the element, the
|
|
* index and the array) and should return a string that will be used as the
|
|
* key for the element in the new object. If the function returns the same
|
|
* key for more than one element, the value for that key is
|
|
* implementation-defined.
|
|
* @param {S=} opt_obj The object to be used as the value of 'this'
|
|
* within keyFunc.
|
|
* @return {!Object<T>} The new object.
|
|
* @template T,S
|
|
*/
|
|
goog.array.toObject = function(arr, keyFunc, opt_obj) {
|
|
var ret = {};
|
|
goog.array.forEach(arr, function(element, index) {
|
|
ret[keyFunc.call(/** @type {?} */ (opt_obj), element, index, arr)] =
|
|
element;
|
|
});
|
|
return ret;
|
|
};
|
|
|
|
|
|
/**
|
|
* Creates a range of numbers in an arithmetic progression.
|
|
*
|
|
* Range takes 1, 2, or 3 arguments:
|
|
* <pre>
|
|
* range(5) is the same as range(0, 5, 1) and produces [0, 1, 2, 3, 4]
|
|
* range(2, 5) is the same as range(2, 5, 1) and produces [2, 3, 4]
|
|
* range(-2, -5, -1) produces [-2, -3, -4]
|
|
* range(-2, -5, 1) produces [], since stepping by 1 wouldn't ever reach -5.
|
|
* </pre>
|
|
*
|
|
* @param {number} startOrEnd The starting value of the range if an end argument
|
|
* is provided. Otherwise, the start value is 0, and this is the end value.
|
|
* @param {number=} opt_end The optional end value of the range.
|
|
* @param {number=} opt_step The step size between range values. Defaults to 1
|
|
* if opt_step is undefined or 0.
|
|
* @return {!Array<number>} An array of numbers for the requested range. May be
|
|
* an empty array if adding the step would not converge toward the end
|
|
* value.
|
|
*/
|
|
goog.array.range = function(startOrEnd, opt_end, opt_step) {
|
|
var array = [];
|
|
var start = 0;
|
|
var end = startOrEnd;
|
|
var step = opt_step || 1;
|
|
if (opt_end !== undefined) {
|
|
start = startOrEnd;
|
|
end = opt_end;
|
|
}
|
|
|
|
if (step * (end - start) < 0) {
|
|
// Sign mismatch: start + step will never reach the end value.
|
|
return [];
|
|
}
|
|
|
|
if (step > 0) {
|
|
for (var i = start; i < end; i += step) {
|
|
array.push(i);
|
|
}
|
|
} else {
|
|
for (var i = start; i > end; i += step) {
|
|
array.push(i);
|
|
}
|
|
}
|
|
return array;
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns an array consisting of the given value repeated N times.
|
|
*
|
|
* @param {VALUE} value The value to repeat.
|
|
* @param {number} n The repeat count.
|
|
* @return {!Array<VALUE>} An array with the repeated value.
|
|
* @template VALUE
|
|
*/
|
|
goog.array.repeat = function(value, n) {
|
|
var array = [];
|
|
for (var i = 0; i < n; i++) {
|
|
array[i] = value;
|
|
}
|
|
return array;
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns an array consisting of every argument with all arrays
|
|
* expanded in-place recursively.
|
|
*
|
|
* @param {...*} var_args The values to flatten.
|
|
* @return {!Array<?>} An array containing the flattened values.
|
|
*/
|
|
goog.array.flatten = function(var_args) {
|
|
var CHUNK_SIZE = 8192;
|
|
|
|
var result = [];
|
|
for (var i = 0; i < arguments.length; i++) {
|
|
var element = arguments[i];
|
|
if (goog.isArray(element)) {
|
|
for (var c = 0; c < element.length; c += CHUNK_SIZE) {
|
|
var chunk = goog.array.slice(element, c, c + CHUNK_SIZE);
|
|
var recurseResult = goog.array.flatten.apply(null, chunk);
|
|
for (var r = 0; r < recurseResult.length; r++) {
|
|
result.push(recurseResult[r]);
|
|
}
|
|
}
|
|
} else {
|
|
result.push(element);
|
|
}
|
|
}
|
|
return result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Rotates an array in-place. After calling this method, the element at
|
|
* index i will be the element previously at index (i - n) %
|
|
* array.length, for all values of i between 0 and array.length - 1,
|
|
* inclusive.
|
|
*
|
|
* For example, suppose list comprises [t, a, n, k, s]. After invoking
|
|
* rotate(array, 1) (or rotate(array, -4)), array will comprise [s, t, a, n, k].
|
|
*
|
|
* @param {!Array<T>} array The array to rotate.
|
|
* @param {number} n The amount to rotate.
|
|
* @return {!Array<T>} The array.
|
|
* @template T
|
|
*/
|
|
goog.array.rotate = function(array, n) {
|
|
goog.asserts.assert(array.length != null);
|
|
|
|
if (array.length) {
|
|
n %= array.length;
|
|
if (n > 0) {
|
|
Array.prototype.unshift.apply(array, array.splice(-n, n));
|
|
} else if (n < 0) {
|
|
Array.prototype.push.apply(array, array.splice(0, -n));
|
|
}
|
|
}
|
|
return array;
|
|
};
|
|
|
|
|
|
/**
|
|
* Moves one item of an array to a new position keeping the order of the rest
|
|
* of the items. Example use case: keeping a list of JavaScript objects
|
|
* synchronized with the corresponding list of DOM elements after one of the
|
|
* elements has been dragged to a new position.
|
|
* @param {!IArrayLike<?>} arr The array to modify.
|
|
* @param {number} fromIndex Index of the item to move between 0 and
|
|
* {@code arr.length - 1}.
|
|
* @param {number} toIndex Target index between 0 and {@code arr.length - 1}.
|
|
*/
|
|
goog.array.moveItem = function(arr, fromIndex, toIndex) {
|
|
goog.asserts.assert(fromIndex >= 0 && fromIndex < arr.length);
|
|
goog.asserts.assert(toIndex >= 0 && toIndex < arr.length);
|
|
// Remove 1 item at fromIndex.
|
|
var removedItems = Array.prototype.splice.call(arr, fromIndex, 1);
|
|
// Insert the removed item at toIndex.
|
|
Array.prototype.splice.call(arr, toIndex, 0, removedItems[0]);
|
|
// We don't use goog.array.insertAt and goog.array.removeAt, because they're
|
|
// significantly slower than splice.
|
|
};
|
|
|
|
|
|
/**
|
|
* Creates a new array for which the element at position i is an array of the
|
|
* ith element of the provided arrays. The returned array will only be as long
|
|
* as the shortest array provided; additional values are ignored. For example,
|
|
* the result of zipping [1, 2] and [3, 4, 5] is [[1,3], [2, 4]].
|
|
*
|
|
* This is similar to the zip() function in Python. See {@link
|
|
* http://docs.python.org/library/functions.html#zip}
|
|
*
|
|
* @param {...!IArrayLike<?>} var_args Arrays to be combined.
|
|
* @return {!Array<!Array<?>>} A new array of arrays created from
|
|
* provided arrays.
|
|
*/
|
|
goog.array.zip = function(var_args) {
|
|
if (!arguments.length) {
|
|
return [];
|
|
}
|
|
var result = [];
|
|
var minLen = arguments[0].length;
|
|
for (var i = 1; i < arguments.length; i++) {
|
|
if (arguments[i].length < minLen) {
|
|
minLen = arguments[i].length;
|
|
}
|
|
}
|
|
for (var i = 0; i < minLen; i++) {
|
|
var value = [];
|
|
for (var j = 0; j < arguments.length; j++) {
|
|
value.push(arguments[j][i]);
|
|
}
|
|
result.push(value);
|
|
}
|
|
return result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Shuffles the values in the specified array using the Fisher-Yates in-place
|
|
* shuffle (also known as the Knuth Shuffle). By default, calls Math.random()
|
|
* and so resets the state of that random number generator. Similarly, may reset
|
|
* the state of the any other specified random number generator.
|
|
*
|
|
* Runtime: O(n)
|
|
*
|
|
* @param {!Array<?>} arr The array to be shuffled.
|
|
* @param {function():number=} opt_randFn Optional random function to use for
|
|
* shuffling.
|
|
* Takes no arguments, and returns a random number on the interval [0, 1).
|
|
* Defaults to Math.random() using JavaScript's built-in Math library.
|
|
*/
|
|
goog.array.shuffle = function(arr, opt_randFn) {
|
|
var randFn = opt_randFn || Math.random;
|
|
|
|
for (var i = arr.length - 1; i > 0; i--) {
|
|
// Choose a random array index in [0, i] (inclusive with i).
|
|
var j = Math.floor(randFn() * (i + 1));
|
|
|
|
var tmp = arr[i];
|
|
arr[i] = arr[j];
|
|
arr[j] = tmp;
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns a new array of elements from arr, based on the indexes of elements
|
|
* provided by index_arr. For example, the result of index copying
|
|
* ['a', 'b', 'c'] with index_arr [1,0,0,2] is ['b', 'a', 'a', 'c'].
|
|
*
|
|
* @param {!Array<T>} arr The array to get a indexed copy from.
|
|
* @param {!Array<number>} index_arr An array of indexes to get from arr.
|
|
* @return {!Array<T>} A new array of elements from arr in index_arr order.
|
|
* @template T
|
|
*/
|
|
goog.array.copyByIndex = function(arr, index_arr) {
|
|
var result = [];
|
|
goog.array.forEach(index_arr, function(index) { result.push(arr[index]); });
|
|
return result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Maps each element of the input array into zero or more elements of the output
|
|
* array.
|
|
*
|
|
* @param {!IArrayLike<VALUE>|string} arr Array or array like object
|
|
* over which to iterate.
|
|
* @param {function(this:THIS, VALUE, number, ?): !Array<RESULT>} f The function
|
|
* to call for every element. This function takes 3 arguments (the element,
|
|
* the index and the array) and should return an array. The result will be
|
|
* used to extend a new array.
|
|
* @param {THIS=} opt_obj The object to be used as the value of 'this' within f.
|
|
* @return {!Array<RESULT>} a new array with the concatenation of all arrays
|
|
* returned from f.
|
|
* @template THIS, VALUE, RESULT
|
|
*/
|
|
goog.array.concatMap = function(arr, f, opt_obj) {
|
|
return goog.array.concat.apply([], goog.array.map(arr, f, opt_obj));
|
|
};
|