Simplest way to obfuscate and deobfuscate a string in JavaScript

Question

I\'m looking for a way to obfuscate and deobfuscate a string in JavaScript; by which I mean encryption and decryption when security is not an issue. Ideally something native

Answer 1

It's worth noting that

(![]+[])[+[]]+(![]+[])[+!+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]

evaluates to the string "fail" without ever looking like a string. Seriously, enter it into node and be amazed. You can spell anything in JavaScript by being crazy.