This works as expected:
> 0b1111
15
> 0b1111 & 0b1111
15
But this doesn't:
> 0b11111111111111111111111111111111
4294967295
> 0b11111111111111111111111111111111 & 0b11111111111111111111111111111111
-1
What's going on here? And how can I safely perform bitwise operations on large (up to 2^32) numbers in Javascript?
Update: This is below Number.MAX_SAFE_INTEGER so I don't believe there should be a loss of precision.
What's going on here?
JavaScript's bitwise operators will interpret the result as a signed 32-bit number (one exception is the >>> operator), but apart from that, the result is correct.
And how can I safely perform bitwise operations on large (up to 2^32) numbers in Javascript?
Apply >>> 0 to the result so the result is interpreted as an unsigned 32 bit number:
let res = (0b11111111111111111111111111111111
& 0b11111111111111111111111111111111) >>> 0;
console.log(res);