'use strict';

const voted = {};
function check_voter(name) {
  if (voted[name]) {
    console.log('kick them out!');
  } else {
    voted[name] = true;
    console.log('let them vote!');
  }
}


check_voter("tom"); // let them vote!
check_voter("mike"); // let them vote!
check_voter("mike"); // kick them out!