src/idiom

apply is a shortcut to Function.apply with this as third, optional parameter (defaults to null).

@apply = apply = (f, args, ctx = null) -> f.apply ctx, args

take runs a function with a given context and returns it, encapsulating the usage of an object.

first3 = take ([1, 2]) -> @push 3

@take = take = (x, f) -> f.call x; x

kindof returns the class of an object. It plays the role of typeof, only it doesn't report 'object' for pretty much everything, and yields the actual prototypes instead of strings.

kindof(undefined)   is undefined
kindof(null)        is null
kindof(1)           is Number
kindof('foo')       is String
kindof([])          is Array
kindof({})          is Object
kindof(new class X) is X

@kindof = (x) -> if x? then x.constructor else x

async takes a sync function that returns or throws and creates an async version that takes a callback as last parameter. The callback is then invoked with either (null, result) or (exception, null).

@async = (f) -> (args..., $) -> try $ null, apply f, args catch e $ e, null

extend injects into its first argument all own properties of later arguments, from left to right, so that later parameters take precedence.

@extend = extend = (base, extras...) -> for object in extras base[key] = object[key] for own key of object base

merge works like extend, but starts with a new empty base object.

@merge = (objects...) -> objects.unshift {} apply extend, objects

dict creates an object from an array of [key, value] pairs, paving the way for python-like object comprehensions.

obj = dict([x, 'number: ' + x] for x in [1..10])

@dict = (pairs = []) -> take {}, -> @[pair[0]] = pair[1] for pair in pairs

clone deep-clones an object of any type. null, undefined, numbers and strings clone to themselves. Nested arrays and objects are properly duplicated.

@clone = clone = (object) -> if object? and typeof object is 'object' take Object.create(object.constructor.prototype), -> @[key] = clone object[key] for own key of object else object

export makes idioms globally available. You can inject into another object, instead of global, by passing it as parameter.

@export = (host = global) => host[key] = @[key] for key of @ when key isnt 'export' @