JSFuck

<p>JSFuck is an <a href="/facts/Esolang/nyRNfC2P">esoteric</a> <a href="/facts/Subset/SJGERmbA">subset</a> of <a href="/facts/JavaScript/XhhIIEsl">JavaScript</a>, where <a href="/facts/Code/CSntvnEo">code</a> is written using only six <a href="/facts/Character_(symbol)/F6lt3g5D">characters</a>: [, ], (, ), !, and +.  The name is derived from <a href="/facts/Brainfuck/tgomHQ3q">Brainfuck</a>, an esoteric programming language that also uses a minimalistic <a href="/facts/Alphabet_(formal_languages)/6KW9qYRW">alphabet</a> of only <a href="/facts/Punctuation/YsE7u4W6">punctuation</a>. Unlike Brainfuck, which requires its own <a href="/facts/Compiler/WNfCDFJe">compiler</a> or <a href="/facts/Interpreter_(computing)/JB85fbyb">interpreter</a>, JSFuck is valid JavaScript code, meaning that JSFuck programs can be run in any <a href="/facts/Web_browser/2pfyymLs">web browser</a> or <a href="/facts/JavaScript_engine/6YEG2JFH">engine</a> that interprets JavaScript. JSFuck is able to recreate all JavaScript functionality using such a limited set of characters because JavaScript allows the evaluation of any expression as any type.
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JSFuck open-in-new

JSFuck