text: const log=console.log;
  
  const arr=['red','green','blue'];
  log(arr.includes('green'));
  
  
  const str='onur dayibasi'
  const a=str.includes('ur'); log(a);
  const b=str.indexOf('ur');  log(b);
  const c=str.match(/ur/g);  log(c);
  const d=(new RegExp('ur')).test(str); log(d)
  