numConvert.js

function decToBin(int) {
  let bin = ''

  while (int) {
    const digit = int % 2

    bin = digit + bin
    int -= digit
    int /= 2
  }

  return bin
}

function decToOct(int) {
  let octal = ''

  while (int) {
    const digit = int % 8

    octal = digit + octal
    int -= digit
    int /= 8
  }

  return octal
}

function decToHex(int) {
  const digits = '0123456789abcdef'
  let hex = ''

  while (int) {
    const digit = int % 16

    hex = digits[digit] + hex
    int -= digit
    int /= 16
  }

  return hex
}