How does this obfuscated code work?

Question

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This JavaScript code displays "Hello, world!". Can anyone explain me how does this work.

Here's an article that might help: http://patriciopalladino.com/blog/2012/08/09/non-alphanumeric-javascript.html — nnnnnn, Mar 13 '17 at 06:27
Not sure if this is exactly the same thing being done, but here is a similar thing in JS that uses returned strings (such as `[]+1/!1` evaluating to `"Infinity"`) and substrings to get strings without any input strings. — RedBassett, Mar 13 '17 at 06:30
It works by giving non-technical managers a way to feel superior to job applicants for JavaScript programming positions by giving them something obnoxious to ask about during an interview. — Paul, Mar 13 '17 at 06:31

score 1 · Accepted Answer · edited May 23 '17 at 12:10

This post is made in accordance with this meta post.

As @Thomas has mentioned in the comments, this is JSFuck. More explanation can be found on the site. Basics (from the same site):

Basics

false       =>  ![]
true        =>  !![]
undefined   =>  [][[]]
NaN         =>  +[![]]
0           =>  +[]
1           =>  +!+[]
2           =>  !+[]+!+[]
10          =>  [+!+[]]+[+[]]
Array       =>  []
Number      =>  +[]
String      =>  []+[]
Boolean     =>  ![]
Function    =>  []["filter"]
eval        =>  []["filter"]["constructor"]( CODE )()
window      =>  []["filter"]["constructor"]("return this")()

How does this obfuscated code work?

1 Answers1