Number of Steps to Reduce a Number in Binary Representation to One

export function numSteps(s: string): number {
  let answer = 0;
  let carry = 0;
 
  for (let i = s.length - 1; 0 < i; i--) {
    const bit = parseInt(s[i]);
    if (bit + carry === 1) {
      carry = 1;
      answer += 1;
    }
    answer += 1;
  }
 
  return answer + carry;
}