text: /**
   * @param {string} a
   * @param {string} b
   * @return {number}
   */
  export default function hammingDistance(a, b) {
    if (a.length !== b.length) {
      throw new Error('Strings must be of the same length');
    }
  
    let distance = 0;
  
    for (let i = 0; i < a.length; i += 1) {
      if (a[i] !== b[i]) {
        distance += 1;
      }
    }
  
    return distance;
  }
  