refactoring

refactored.js

function createUser(email, password) {
  validateInput(email, password);

  saveUser(email, password);
}

function isNotValid(email, password) {
  return emailNotValid(email) || passwordNotValid(password);
}

function emailNotValid(email) {
  return !email || !email.includes("@");
}
function passwordNotValid(password) {
  return !password || password.trim() == "";
}

function showErrorMessage(message) {
  console.log(message);
}

function saveUser(user) {
  const user = {
    email: email,
    password: password,
  };
  database.insert(user);
}

function validateInput(email, password) {
  if (isNotValid(email, password)) {
    throw new Error("Invalid input");
  }
}

to-be-refactor.js

function createUser(email, password) {
  if (!email || !email.includes("@") || !password || password.trim() == "") {
    console.log("Invalid input!");
    return;
  }

  const user = {
    email: email,
    password: password,
  };

  database.insert(user);
}