How to left-shift numbers greater than 32-bits? [duplicate]

Question

As I understand it, JS treats numbers as 32-bits when performing bit-shift operations, even though it supports 64-bit numbers.

How can I implement a leftShift function that works on 64-bit numbers? i.e., it won't roll over into the negatives for something like 192 << 24 (should be 3221225472, not -1073741824).

Answer 1

Just do what the math of a left shift does:

Arithmetic shifts are equivalent to multiplication by a positive (to the left) or by a negative number (to the right), integral power of the radix (e.g. a multiplication by a power of 2 for binary numbers).

function shift(number, shift) {
    return number * Math.pow(2, shift);
}

shift(192, 24)
//3221225472

shift(3221225472, -24)
//192