meta-promise

Experimental implementation of promises on top of ES Harmony Proxies.

Status

This implementation is in early alpha state. Since Spidermonkey is only javascript engine implementing Proxies so far, you can try this out either on Firefox 4 using teleport or using jetpack.

Install

npm install meta-promise

Play

cd /usr/local/lib/node/.npm/meta-promise/active/package/
teleport activate

What works so far

var mp = require('meta-promise')
// In teleport please run following seperately from first line.
if ('undefined' == typeof setTimeout)
  var setTimeout = require('timer').setTimeout
var deferred = mp.defer()
var promise = deferred.promise // Promise that can be shared with consumers.
// `mp.print` takes promise and prints it when promise is fullfilled.
mp.print(promise.some.object.message)
mp.print(promise.some.object.talk('meta-promise'))
mp.print(promise.some.object.talk.apply({
  message: 'You can also use apply with {{name}}'
}, ['meta-promise']))
mp.print(promise.some.object.talk.apply({
  message: 'You can also use call with {{name}}'
}, ['meta-promise']))

setTimeout(function() {
  deferred.resolve(
  { some:
    { object:
      { message: 'Hello {{name}} !'
      , talk: function talk(name) {
          return this.message.replace('{{name}}', name);
        }
      }
    }
  })
}, 100)
// 'Hello {{name}} !' will be printed in 100ms.
// 'Hello meta-promise !' will be printed in 100ms.
// 'You can also use apply with meta-promise'
// 'You can also use call with meta-promise'