getter, setter and lazy

etter.coffee

multi = (fn) -> (obj, name, a) ->
  if a? then fn obj, name, a
  else fn obj, name_, a_  for name_, a_ of name

def = (obj, name, prop) ->
  prop.configurable ?= true
  prop.enumerable ?= true
  Object.defineProperty obj, name, prop

module.exports = exports =
  etter:  multi def
  getter: multi (obj, name, get) -> def obj, name, { get }
  setter: multi (obj, name, set) -> def obj, name, { set }
  lazy:   multi (obj, name, get) -> exports.getter obj, name, ->
    value = get.call this
    def this, name, { value, writable: false }
    value

package.json

{
  "name": "etter",
  "version": "0.1.1",
  "main": "etter.coffee",
  "repository": {
    "type": "git",
    "url": "git://gist.github.com/4650898.git"
  },
  "license": "BSD"
}