Example 4-11. Eager invocation of aggregate functions

function resolveLater(value) {
	return new Bluebird(function (resolve, reject) {
		setTimeout(function () {
			resolve(value);
		}, 1000);
	});
}

var numbers = Bluebird.resolve([
	1,
	resolveLater(2),
	3
]);

console.log('Square the following numbers...');
numbers.map(function square(num) {
	console.log(num);
	return num * num;
}).then(function (result) {
	console.log('The squares of those numbers are...');
	console.log(result.join(', '));
});

// Console output:
// Square the following numbers...
// 1
// 3
// 2
// The squares of those numbers are...
// 1, 4, 9