Password Obfuscator Function

password.js

function changeWord (string) {
  var result = "";
  for (var i = 0; i < string.length; i++) {
    if (string[i] === "a") {
      result += "4";
    } else if (string[i] === "e") {
      result +=  "3";
    } else if (string[i] === "o") {
      result += "0";
    } else if (string[i] === "l") {
      result += "1";
    }
    else
      result += string[i];
  }
  return result;
};

console.log(changeWord("password"));