Bluebird Promise Re-try

promiseRetry.js

function promiseRetry(_fn, _attempts, backoff /* , errTypes */) {
	var fn        = Bluebird.method(_fn),
		attempts  = parseInt(_attempts, 10);

	var argsLen   = arguments.length,
		retryLen  = promiseRetry.length,
		catchArgs = new Array(Math.max(1, argsLen - retryLen + 1));

	for (var i = retryLen; i < argsLen; i += 1) {
		catchArgs[i - retryLen] = arguments[i];
	}
	catchArgs[catchArgs.length - 1] = waitTry;

	function waitTry(err) {
		return Bluebird.delay(backoff)
			.return(err)
			.then(tryAgain);
	}

	function tryAgain(err) {
		if (!isNaN(attempts) && attempts-- <= 0) {
			throw err;
		}

		return Bluebird.prototype.catch.apply(fn(), catchArgs);
	}

	return Bluebird.try(tryAgain);
}

promiseRetry(doSomething, 5, 200).then(function (result) {
	console.log(result);
});