Promise based serial tasks executor (version #3: Create initial promise | Array.prototype.reduce)

gistfile1.js

"use strict";

function serial(tasks, ...args) {

    let results = [];

    let lastPromise = tasks.reduce(function(prevPromise, curTask) {

        return prevPromise.then(function(prevResult) {

            results.push(prevResult);

            return curTask(...args);
        });
    }, Promise.resolve());

    return lastPromise.then(function(lastResult) {

        results.push(lastResult);

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

        return results;
    });
}