moreSuggestions.js

const name = document.querySelector('.name');
const email = document.querySelector('.email');
const error = document.querySelector('.error');
const firstpassword = document.querySelector('.password1');
const secondpassword = document.querySelector('.password2');
const textName = document.querySelector('.nameText');
const textEmail = document.querySelector('.emailText');
const textPassword = document.querySelector('.passwordText');

const button = document.querySelector('button');
button.addEventListener('click', validateForm);

function validateForm() {
  let formValidated = true;
  [textName, textEmail, textPassword].forEach(errorText => {
    errorText.innerText = '';
  });
  if (name.value.length < 3) {
    textName.innerText = 'Name must be at least 3 characters long...';
    formValidated = false;
    return;
  }
  if (email.value.indexOf('@') == -1 || email.value.indexOf('.') == -1) {
    textEmail.innerText = 'Insert a valid email..';
    formValidated = false;
    return;
  }
  if (firstpassword.value <= 0) {
    textPassword.innerText = 'Enter a password, joker.';
    formValidated = false;
    return;
  }
  if (firstpassword.value !== secondpassword.value) {
    textPassword.innerText = 'Passwords must match...';
    formValidated = false;
    return;
  }
  if (formValidated) {
    window.confirm('Registration successful! A win is you!');
  }
}