How to select all items in array at once, and add class to them

Question

I would like this function to hide buttons in my html, by giving them css .hidden attribute. I have tried [0, 1, 2, 3, 4] but it does not work as supposed, this code works but I was wondering if there is a more efficient way to do it..?

function hideButtons(){
var buttons = document.querySelectorAll('.buttons');
  buttons[0].classList.add('hidden'); 
  buttons[1].classList.add('hidden');
  buttons[2].classList.add('hidden');
  buttons[3].classList.add('hidden');
  buttons[4].classList.add('hidden');
}

Answer 1

Use a simple loop

for(var i = 0; i < buttons.length; i++){
    buttons[i].classList.add('hidden');
}