simple promise

promise.js

function Promise(context) {
  this.context = context || this;
  this.success = [];
  this.error = [];
}

Promise.prototype.then = function (success, error) {
  if (success) {
    if (this.resolved) {
      success.apply(this.context, this.resolved);
    }
    else {
      this.success.push(success);
    }
  }
  
  if (error) {
    if (this.rejected) {
      error.apply(this.context, this.rejected);   
    }
    else {
      this.error.push(error);
    }
  }

  return this;
};

Promise.prototype.resolve = function () {
  var callback;
  this.resolved = arguments;
  this.error = [];
  while (callback = this.success.shift()) {
    callback.apply(this.context, this.resolved);
  }
};

Promise.prototype.reject = function () {
  var callback;
  this.rejected = arguments;
  this.success = [];
  while (callback = this.error.shift()) {
    callback.apply(this.context, this.rejected);
  }
};