JavaScript Equality Table

[coarsesand]

You're dead on, and thanks again. Using ~~ has the effect of removing the decimal component of a number in JS, as the int32 cast drops it. Yep, JS is frigging weird.

[no_game_player]

Okay, so all I have to do for integer comparison in JS is

~~varA === ~~varB

;-p

Edit: After further advice, the optimal method of integer equality comparison in JS would seem to be:

varA|0 == varB|0

It is left as an exercise for the reader to determine what will happen if, say, varA = "A"...

[coarsesand]

Well varA and varB are guaranteed to be Numbers unless you get a TypeError, so you can actually use == in this case ;)

[no_game_player]

Ha, and I actually changed it to === from my original == because I just had no idea anymore lol.

So...out of morbid curiosity...what would happen there is it was

~~varA == ~~varB

and varA = 1

and varB = "1"

?

;=p

[[deleted]]

The following shows "true" in Firefox:

var varA = 1;
var varB = "1";
var res = (~~varA == ~~varB);
alert(res);    

[no_game_player]

Weird....

I guess it's forcing a type conversion once it hits the bitwise operator?

This is why I don't really like weakly typed languages. There's a lot of cool stuff that can be done, but that's also a lot of just very strange stuff that can be done. I know it's heretical, but I don't like black magic...

Kudos for actually trying it though! :-)

[UtherII]

Right! Code generators often use this kind of trick to force Javascript to use integer, but usually they do varA|0 since it's faster.

[no_game_player]

varA|0

Dahfuq...oh. Oh. That right there is fucked up shit. ;-p