Function filter

when.js:220–224

* Filter the provided array of promises using the provided predicate. Input may * contain promises and values * @param {Array|Promise} promises array of promises and values * @param {function(x:*, index:Number):boolean} predicate filtering predicate. * Must return truthy (or promise for tr

(promises, predicate)

	 *  for which predicate returned truthy.
	 */
	function filter(promises, predicate) {
		return when(promises, function(promises) {
			return Promise.filter(promises, predicate);
		});
	}

	return when;
});