//- VIET HAM XOA N PHAN TU BEN TRAI CUA HAM CHO TRUOC
const bai1 = (val, n) => {
  return val.slice(n);
};
//console.log('bai 1: ',bai1('asd',1));
//- VIET HAM TINH THOI GIAN THUC THI Cua 1 HAM
const bai2 = (fn) => {
   const result = fn();
}
console.log(bai2(() => 5+3));
//- VIET HAM NHAN 1 URL CHUYEN URL THANH cac OBJECT
//VD http://www.example.com?firstName=A&lastName=Nguyen
const bai3 = (url) => {
    url = url.slice(url.indexOf('?')+1);
    return url.split('&')
    .map((v,i) => v.split('='))
    .map((v,i) => ( { [v[0]] : v[1] } ));
}

//console.log('bai 3: ',bai3('http://www.example.com?firstName=A&lastName=Nguyen'));