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// SOLUTION:
// Turns out that the following is the most performant in terms of ops per seconds.
// It iterates on an array, staying within the "while loop" as long as
// the current item exists. Checking also whether using concat to the very same "arr" argument
// or push methods in a new stack array until no items are left within the "arr" argument
const flattenLoop = arr => {
  let stack = []
  let item

  while (item = arr.shift()) {

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/**
 * Flattens passed in array.
 *
 * @param {Array} input is the array to flatten.
 * @returns {out} returns flattened array.
 */

function flatten(input) {
    let i, 
        placeHolder = [input], 

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LESS Coding Guidelines

Inspired on "LESS Coding Guidelines of The Obvious Corporation" ang "Git styleguide"

Naming Conventions

Never reference js- prefixed class names from CSS files. js- are used exclusively from JS files. Use the is- prefix for state rules that are shared between CSS and JS. Classes and IDs are lowercase with words separated by a dash:

Right:

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function makeRequest(url,callback,context) {
  var httpRequest = null;
  if (window.XMLHttpRequest) { // Mozilla, Safari, ...
    httpRequest = new XMLHttpRequest();
  } else if (window.ActiveXObject) { // IE
    try {
      httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e) {
      try {