Javascript is insane

[garote]

''        ==   '0'           // false
0         ==   ''            // true
0         ==   '0'           // true
!0        ==   true          // true
!1        ==   false         // true
false     ==   'false'       // false
false     ==   '0'           // true
false     ==   undefined     // false
false     ==   null          // false
null      ==   undefined     // true
" \t\r\n" ==   0             // true
NaN       ===  NaN           // false
!!NaN     ===  !!NaN         // true

I recently saw someone prefacing their code with

var t=!0;

... Because they wanted to save space in their code by replacing every occurrence of true with t, and also wanted so save two bytes while declaring what t was.

And I thought Perl invited abuse!

If you see anyone doing this, pour your drink on their head.

Comments

[nibot.livejournal.com]

Well, PHP is worse. :-/

"NaN == NaN" is false by IEEE standard. However, the whole idea of "!NaN" (logical negation of NaN?!) is crazy.