Get Difference between Two Strings

getDiff.js

  function getDiff(a, b) {
    var i = 0;
    var j = 0;
    var result = "";

    while (j < b.length) {
      if (a[i] != b[j] || i == a.length) {
        result += b[j];
      } else {
        i++;
      }
      j++;
    }
    return result;
  }

console.log(getDiff("Hello World","Hello This World"));