setUpUI.js

const threadsList = document.querySelector('.threads');
const signedInLinks = document.querySelectorAll('.signed-in');
const signedOutLinks = document.querySelectorAll('.signed-out');

const setUpUI = (user) => {
  if (user) {
    // Toggle UI Elements
    signedInLinks.forEach(item => item.style.display = 'inline');
    signedOutLinks.forEach(item => item.style.display = 'none');
  } else {
    // Toggle UI Elements
    signedInLinks.forEach(item => item.style.display = 'none');
    signedOutLinks.forEach(item => item.style.display = 'inline');
  }
}