Function isHappy

ch7-happycoin-as/happycoin.ts:20–25

(num: u64)

}

function isHappy(num: u64): boolean {
  while (num != 1 && num != 4) {
    num = sumDigitsSquared(num);
  }
  return num === 1;
}

function isHappycoin(num: u64): boolean {
  return isHappy(num) && num % 10000 === 0;