wkei

function intToBase16(num) {
  if (num === 0) return '0'
  const digits = Array.from(new Array(16), (_, i) => i < 10 ? i : String.fromCharCode(65 + i - 10))
  let base16 = ''
  while (num !== 0) {
    base16 = digits[num % 16] + base16
    num = Math.floor(num / 16)
  }
  return base16
}