Content deleted Content added
→Examples: Better comments |
typo |
||
Line 36:
==Examples==
The key to understanding design patterns such as IIFE is to realize that prior to ES6, JavaScript only featured [[Scope (computer science)#Function scope|function scope]] (thus lacking [[Scope (computer science)#Block scope|block scope]]), passing [[Call_by_reference|values by reference]] inside [[Closure (computer science)|closure]]s.<ref>{{cite book |last=Haverbeke |first=Marijn |title=Eloquent JavaScript |year=2011 |publisher=No Starch Press |isbn=978-1-59327-282-1 |pages=29–30}}</ref> This is no longer the case, as the ES6 version of JavaScript implements block scoping using the new <code>let</code> and <code>const</code> keywords.<ref>{{cite web |last1=Orendorff |first1=Jason |title=ES6 In Depth: let and const |url=https://hacks.mozilla.org/2015/07/es6-in-depth-let-and-const/ |website=Mozilla Hacks – the Web developer blog |publisher=[[Mozilla]] |access-date=16 October 2024 |date=31 Jul 2015}}</ref><syntaxhighlight lang="javascript">
// Before ES6: Creating a scope using an
var foo = 1;
var bar = 2;
| |||