Function apply

node.js:61–63

* Takes a node-style async function and calls it immediately (with an optional * array of arguments or promises for arguments). It returns a promise whose * resolution depends on whether the async functions calls its callback with the * conventional error argument or not. * * With this it

(f, args)

	 * @returns {Promise} promise for the value func passes to its callback
	 */
	function apply(f, args) {
		return _apply(f, this, args || []);
	}

	function dispatch(f, thisArg, args, h) {
		var cb = createCallback(h);