update with macro syntax and some other stuff

This commit is contained in:
Brian Picciano 2014-10-01 17:46:29 -04:00
parent 7a732b4b05
commit 3cab34ad31

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@ -23,80 +23,94 @@ This is also a string, it can contain anything:
"! I'm the king of the world !"
```
This is a list. It evaluates to a linked-list of its elements (not lisp-like!):
This is a list. It evaluates to a linked-list of four strings:
```
(a b c d)
```
This is a string:
This is a vector of those same elements. It's like a list, but has some slightly
different properties. We'll mostly be using lists:
```
[a b c d]
```
This is a string
```
+
```
This is a string being evaluated, it will return a function:
`:` is the evaluator. This evaluates to a function which adds its arguments:
```
:+
```
This is a list, with a string and two numbers:
```
(+ 1 2)
```
This is a list, with a function and two numbers:
This evaluates to list whose elements are a function and two numbers:
```
(:+ 1 2)
```
This is a list being evalutated, the first item in the list must be a function:
This evaluates to the number 5:
```
:(:+ 1 2)
```
This is a list in a list:
The `fn` function can be used to define a new function. This evaluates to an
anonymous function which adds one to its argument and returns it:
```
((a b) foo bar)
:(:fn [x]
:(:+ :x 1))
```
This is an anonymous function, it takes in the arguments `a` and `b`, and
returns their sum:
The `def` function can be used to bind some value to a new variable:
```
#((a b)
:(:+ :a :b))
:(:def foo bar)
# Now :foo will evaluate to the string bar
:(:def incr
(:fn [x]
:(:+ :x 1)))
# Now :incr will evaulate to a function which adds 1 to its argument
#defn is a shortcut for the above
:(:defn incr [x]
:(:+ :x 1))
```
`map` takes in a function and a list, and calls the function on each item in the
list. The following will return `(1 2 3)`:
There are also maps. A map's keys can be any value(?). A map's values can be any
value. This evaluates to a map with 2 key/val pairs:
```
:(:map ; This is a comment, it's ignored
#((a) (:+ :a 1)) ; <- Increment function
(0 1 2))
{ foo :foo
bar (:incr 4) }
```
`name` names a value. After the following call, `:ted` will always evalutate to
`5`:
`.` is the half-evaluator. It only works on lists, and runs the function given
in the first argument with the unevaluated arguments (even if they have `:` in
front). You can generate new code to run on the fly (macros) using the normal
`fn`. This evaluates to a `let`-like function, except it forces you to use the
capitalized variable names in the body (utterly useless):
```
:(:name ted 5)
```
You can name any value, including functions:
:(:defn caplet [mapping body...]
# elem-map maps over every element in a list, embedded or otherwise
::(:elem-map
:(:fn [x]
:(:if (mapping :(:slice :x 1))
(capitalize :x)
:x))
:body))
```
:(:name increment #((a) :(:+ a 1)))
```
Now the `map` example above can be simplified down to:
```
:(:map :increment (0 1 2))
#Usage
.(:caplet [foo "this is foo"
dog "this is dog"]
:(:println :Foo)
:(:println :Dog))
```