Functional programming (map, filter, reduce) in bluebird

functional.js

/* Double all numbers */
Promise.map([1, 2, 3], function(num) {
    return num * 2;
}).then(function(numbers) {
    console.log("The final list of numbers:", numbers);
    //The final list of numbers: [ 2, 4, 6 ]
});

/* Remove all the odd numbers */
Promise.filter([1, 2, 3], function(num) {
    return (num % 2) == 0;
}).then(function(numbers) {
    console.log("The final list of numbers:", numbers);
    // The final list of numbers: [ 2 ]
});

/* Sum all the numbers */
Promise.reduce([1, 2, 3], function(total, num) {
    return total + num;
}, 0).then(function(number) {
    console.log("The final value:", number);
    // The final value: 6
});