ES5 Object.create helpers

object-create.coffee

defaults = writable: true, enumerable: true, configurable: true
initializer = (key) -> (val) ->
  prop = Object.create defaults
  prop[key] = val
  prop

value = initializer 'value'
getter = initializer 'get'
setter = initializer 'set'

modifier = (attrs) -> (prop) -> prop[key]=value for key,value of attrs; prop

hidden = modifier enumerable: false
readonly = modifier writable: false
frozen = modifier configurable: false, writable: false


test = Object.create null,
  a: value 100
  b: getter -> @a
  c: setter -> @b
  d: frozen value 200
  e: frozen hidden value 300
  e: hidden readonly getter -> @x

Just a fun idea I had, trying to find a better way to do something that was posted on IRC without creating separate functions for every combination of attributes.

Another possibility:

compose = (fns...) -> (val) -> val = fn val for fn in fns; val

modifier = (key, value) -> (prop) -> prop[key]=value; prop

hidden = modifier 'enumerable', false
readonly = modifier 'writable', false
noconf = modifier 'configurable', false
frozen = compose readonly, noconf