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/**
 * @module Page
 */
modules.define(
    'page',
    ['i-bem__dom', 'BEMHTML', 'jquery' 'modal'],
    function (provide, BEMDOM, BEMHTML, $, Modal) {

        /**
         * @exports

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/**
 * @module input_type_tel
 */
modules.define(
    'input',
    ['i-bem__dom', 'jquery'],
    function (provide, BEMDOM, jQuery, Input) {

        /* borschik:include:../../libs/intl-tel-input/build/js/intlTelInput.js */

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var loading = {},
    loaded = {},
    head = document.getElementsByTagName('head')[0],
    runCallbacks = function(path, type) {
        var cbs = loading[path], cb, i = 0;
        delete loading[path];
        while(cb = cbs[i++]) {
            cb[type] && cb[type]();
        }
    },

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@kangax's ES6 quiz, explained

@kangax created a new interesting quiz, this time devoted to ES6 (aka ES2015). I found this quiz very interesting and quite hard (made myself 3 mistakes on first pass).

Here we go with the explanations:

Question 1:

(function(x, f = () => x) {

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Intro

http://socialdriver.com/2012/07/20-best-responsive-websites/ lists 20 sites that are supposedly best-in-class when it comes to responsive design techniques. I had a look at the viewport meta tags used in these sites.

Findings

• All sites use width=device-width, with in most cases an additional initial-scale=1. This is good practice.

However:

• 8 sites turn off pinch-zooming by setting maximum-scale to 1, or using user-scalable=no. While there are some corner use cases for this, it does not make sense to do this on text-heavy sites as it impairs accessibility.
• 3 sites use semi-colons as delimiters between viewport values. While this works in newer mobile browsers, it's not officially supported, and breaks in older mobile browser versions.
• 1 site has 2 viewport meta tags (with different values) in the source...

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var loading = {},
    loaded = {},
    head = document.getElementsByTagName('head')[0],
    runCallbacks = function (path, type) {
        var cbs = loading[path], cb, i = 0;
        delete loading[path];
        while (cb = cbs[i++]) {
            cb[type] && cb[type]();
        }
    },

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enum Event {
    enum app: String {
        case install = "app install"
        case launch = "app launch"
    }
    
    enum list: String {
        case created = "list created"
        case deleted = "list deleted"
        case refreshed = "list refreshed"

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const If = (cond) => (truly) => (falsy) => [truly, falsy][!cond + 0]()
const result = If(false)(() => 'true')(() => 'false')

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console.log(1);
(_ => console.log(2))();
eval('console.log(3);');
console.log.call(null, 4);
console.log.apply(null, [5]);
new Function('console.log(6)')();
Reflect.apply(console.log, null, [7])
Reflect.construct(function(){console.log(8)}, []);
Function.prototype.apply.call(console.log, null, [9]);
Function.prototype.call.call(console.log, null, 10);

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const isB = (str) => {
  const strArr = str.split('');
  const stack = [];
  
  for (let char of strArr) {
    if (char.startsWith('[') || char.startsWith('(')) {
      stack.push(char);
    } else {
      
      // Первый символ строки не открывающаяся скобка, значит уже не верно