How to do zero-fill right shift in Dart?

Question

How do I do zero-fill right shift in Google Dart?

Something like: foo >>> 2 for instance.

Answer 1

Zero-fill right shift requires a specific integer size. Since integers in Dart are of arbitrary precision the '>>>' operator doesn't make sense there.

The easiest way to emulate a zero-fill right shift is to bit-and the number first.

Example:

(foo & 0xFFFF) >> 2 // 16 bit zero-fill shift
(foo & 0xFFFFFFFF) >> 2 // 32 bit shift.

Answer 2

You could define a utility function to use:

int zeroFillRightShift(int n, int amount) {
  return (n & 0xffffffff) >> amount;
}

That assumes you have 32-bit unsigned integers and that's ok if you do have.