Promise based serial tasks executor (version #2: Create initial promise | for of)

gistfile1.js

"use strict";

function serial(tasks, ...args) {

    let results = [];
    let prevPromise = Promise.resolve();

    for (let curTask of tasks) {
        prevPromise = prevPromise.then(function(prevResult) {

            results.push(prevResult);

            return curTask(...args);
        });
    }

    return prevPromise.then(function(prevResult) {

        results.push(prevResult);

        // Remove first result since corresponds to the initial Promise
        // created to be able to easily chain all the promises
        results.shift();

        return results;
    });
}