Question

I have 2 numbers in javascript that I want to bit and. They both are 33bit long

in C#:

 ((4294967296 & 4294967296 )==0) is false

but in javascript:

 ((4294967296 & 4294967296 )==0) is true

4294967296 is ((long)1) << 32

As I understand it, it is due to the fact that javascript converts values to int32 when performing bit wise operations.

How do I work around this?
Any suggestions on how to replace bit and with a set of other math operations so that bits are not lost?

Answer 1

You could split each of the vars into 2 32-bit values (like a high word and low word), then do a bitwise operation on both pairs.

The script below runs as a Windows .js script. You can replace WScript.Echo() with alert() for Web.

var a = 4294967296;
var b = 4294967296;

var w = 4294967296; // 2^32

var aHI = a / w;
var aLO = a % w;
var bHI = b / w;
var bLO = b % w;

WScript.Echo((aHI & bHI) * w + (aLO & bLO));