Javascript - Promises

Promises.js

// Definition
// ----------------
var p = new Promise(function(resolve, reject) {
	
	// Do an async task async task and then...

	if(/* good condition */) {
		resolve('Success!');
	}
	else {
		reject('Failure!');
	}
});

// Usage
// ----------------
var p = new Promise(function(resolve, reject) {

p.then(function() { 
	/* do something with the result */
}).catch(function() {
	/* error :( */
})