ECMAScript 6 proxies fun (method missing, negative array indexes)

method-missing.coffee

# Ruby’s “method missing” analog with ES6 proxies.
proxify = (object) ->
  new Proxy object, get: (receiver, name) ->
    object[name] ? object.methodMissing.bind object, name

object = proxify
  a: 1,
  b: 15,
  c: ->
    'called'
  methodMissing: (name, args...) ->
    console.log "Calling missing method #{name} with arguments", args

console.log 'Accessing property "a":', object.a
console.log 'Accessing property "b":', object.b
console.log 'Calling method "c":', object.c()
object.methodName 1, 2, 3, 4

negative-array-indexes.coffee

# Negative array indexes with ES6 direct proxies.
enableNegativeIndexes = (array) ->
  new Proxy array, get: (receiver, name) ->
    console.log 'Proxy#get', array, name
    index = parseInt name
    if not isNaN(index) and index < 0
      array[array.length + index] 
    else 
      array[name]

# array = enableNegativeIndexes [100, 500, 600]
# array[-1] is 600
# => true

yes and it doesn't work with nodejs since that uses v8 :(