app.js

//init
const github = new GitHub;
//init UI
const ui =  new UI;

//Search input
const searchUser = document.getElementById('searchUser');

//search input event listener
searchUser.addEventListener('keyup', (e) => {
  //get input text
  const userText = e.target.value;

  if(userText !== ''){
    //make http call
    github.getUser(userText)
    .then(data => {
      if(data.profile.message === 'Not Found') {
        //show alert
        ui.showAlert('User not found', 'alert alert-danger');
      } else {
        //show profile
        ui.showProfile(data.profile);
      }
    })
  } else {
    //clear profile
    ui.clearProfile();
  }
});