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{{Short description|Javascript design pattern}}
An '''immediately invoked function expression''' (or '''IIFE''', pronounced "iffy", [[International Phonetic Alphabet|IPA]] /ˈɪf.i/) is a [[Programming idiom|programming language idiom]] which produces a [[scope (computer science)|lexical scope]] using [[function scoping]]. It was popular in [[JavaScript]]<ref name="Alman">{{cite web|url=http://benalman.com/news/2010/11/immediately-invoked-function-expression/|title=Immediately Invoked Function Expressions|last=Alman|first=Ben|date=15 November 2010|website=|url-status=live|archive-url=https://web.archive.org/web/20171201033208/http://benalman.com/news/2010/11/immediately-invoked-function-expression/|archive-date=1 December 2017|accessdate=18 January 2019}}</ref> as a method to support [[modular programming]] before the introduction of more standardized solutions such as [[CommonJS]] and [[ECMAScript#6th Edition – ECMAScript 2015|ES modules]].<ref>{{cite web |last1=McGinnis |first1=Tyler |title=JavaScript Modules: From IIFEs to CommonJS to ES6 Modules |url=https://ui.dev/javascript-modules-iifes-commonjs-esmodules/ |website=ui.dev |access-date=18 August 2021 |language=en |date=15 January 2019}}</ref>
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