Codility: MinPerimeterRectangle Solution

1function solution(N) {
2  function perimeter(a, b) {
3    return 2 * (a + b)
4  }
5
6  let min = Infinity
7  let i = 1
8  while (i * i < N) {
9    if (N % i === 0) {
10      min = Math.min(min, perimeter(i, N / i))
11    }
12    i++
13  }
14  if (i * i === N) {
15    min = Math.min(min, 4 * i)
16  }
17
18  return min
19}