Playing around with ES Harmony Proxies

test2.coffee

Proxy ?= require "node-proxy"

desc =
	getPropertyDescriptor: (name) ->
		value: (Proxy.createFunction desc,
			(rest...) ->
				(arg1, args...) ->
					restIdx = 0
					if typeof arg1[name] == 'function'
						arg1[name].apply arg1, rest.map (arg) ->
							if arg == _
								args[restIdx++]
							else
								arg
					else
						arg1[name])

_ = Proxy.create desc

# Testing it...
Number.prototype.add = (y) -> this + y
console.log (_.add 10)(20)
console.log (_.add _)(10, 20)

console.log [0, 10, 20, 30].map _.toString 16
console.log "hello and world".split(" ").map _.length()	# Currently a dummy function call is needed here.

console.log _.length() "hello"

# 
# $ coffee test2.coffee
# 30
# 30
# [ '0', 'a', '14', '1e' ]
# [ 5, 3, 5 ]
# 5
#