Zarema Khalilova Zmoki

https://brendaneich.com/ - блог автора JavaScript

http://www.ecma-international.org/publications/standards/Ecma-262.htm - спецификация ECMA-262 на сайте организации Ecma International

https://github.com/lukehoban/es6features - описание нововведений ECMAScript 2015

http://learn.javascript.ru/es-modern - учебник по ES6 на русском

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	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>JS Bin</title>
	<script src="https://wzrd.in/standalone/expect@latest"></script>
	<script src="https://wzrd.in/standalone/deep-freeze@latest"></script>
	</head>
	<body>

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>JS Bin</title>
	<script src="https://wzrd.in/standalone/expect@latest"></script>
	<script src="https://wzrd.in/standalone/deep-freeze@latest"></script>
	</head>
	<body>

	function leadZero(number, length) {
	while(number.toString().length < length){
	number = '0' + number;
	}
	return number;
	}