JSFuck

()+
[]!

JSFuck is an esoteric and educational programming style based on the atomic parts of JavaScript. It uses only six different characters to write and execute code.

It does not depend on a browser, so you can even run it on Node.js.

Links

• View source on GitHub
• Follow @aemkei (Martin Kleppe)
• Original discussion at Sla.ckers.org
• Alternatives: Hieroglyphy (8 chars), utf-8.jp (broken)

Basics

• 'false' => ![]
• 'true' => !![]
• 'undefined' => [][[]]
• 'NaN' => +[![]]
• 'Array' => []
• 'Number' => +[]
• 'String' => []+[]
• 'Boolean' => ![]
• 'Function' => []["sort"]
• eval => []["sort"]["constructor"]( CODE )()
• window => []["sort"]["constructor"]("return this")()

See the full list here.