What's the best way in JavaScript to test if a given parameter is a square number?

Question

I created a function that will test to see if a given parameter is a square number.

Read about square numbers here: https://en.wikipedia.org/?title=Square_number

<

Answer 1

It's a bit trickier if you're using the new BigInt in JavaScript:

// integer square root function (stolen from the interwebs)
function sqrt(n) {
  let a = 1n;
  let b = (n >> 5n) + 8n;
  while (b >= a) {
    let mid = (a + b) >> 1n;
    if (mid * mid > n) {
      b = mid -= 1n;
    } else {
      a = mid += 1n;
    }
  }
  return a -= 1n;
}

sqrt(25n) === 5n
sqrt(26n) === 5n
...
sqrt(35n) === 5n

The best and fastest way I've found (so far) to determine if n is a square is:

function isSquare(n) {
   return n%sqrt(n) === 0n
}

But there's gotta be a faster way for BigInt operations.