Extends Promise with a new property. Tells the Promise to take at least a minimum of given time before returning it

takeAtLeast.js

/**
 * Extends Promise with a new property. Tells the Promise to take at least a minimum of given time.
 * 
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/prototype
 * 
 * Example:
 * 
 * var p = new Promise(function (resolve, reject) { ... });
 * p.takeAtLeast(1000).then(function () { ... });
 */
Promise.prototype.takeAtLeast = function (ms) {
    var wait = new Promise(function (resolve) {
        setTimeout(function () {
            resolve();
        }, ms);
    });

    return Promise.all([this, wait]).then(function (p) {
        return p[0];
    });
};