Santiago Esteva sesteva

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

	function partition ( list, prop, begin, end, pivot ) {
	var piv = list[pivot];
	swap (list, pivot, end-1 );
	var store = begin;
	var ix;
	for ( ix = begin; ix < end - 1; ++ix ) {
	if ( list[ix][prop] <= piv[prop] ) {
	swap (list, store, ix );
	++store;
	}

	function exceptionalException(message) {
	'use strict';
	if (exceptionalException.emailErrors !== false) {
	exceptionalException.emailErrors = confirm('We had an error reporting an error! Please email us so we can fix it?');
	}
	}
	//test
	//exceptionalException('try 1!');
	//exceptionalException('try 2!');