ginger/functions.md

Functions

Functions are first-class citizens in ginger. The simplest anonymous function can be created like so:

(. fn [x]
    (: + x 1))

This function takes in a single number and returns that number plus one. It could be assigned to a variable on the package using def, or by using the shortcut defn. The following two statements are equivalent:

(def incr
    (. fn [x]
        (: + x 1)))

(. defn incr [x]
    (: + x 1))

Variadic function

Functions may take in any number of variables using the ... syntax, similar to how go does variadic functions. The variadic variable must be the last in the function's argument list, and is used as a list inside of the function. A list may also be used as the input for a variadic function, also using the ... syntax.

The following is an example of both defining a variadic function and both ways of using it. + is a variadic function in this example:

(. defn avg [...x]
    (/
        (+ x...)
        (len x)))

(: fmt.Println (avg 1 2 3 4 5))