For is only getting odd numbers

Question

So I have this code that deletes options from a select (0-23) but it's only deleting 0 and odd numbers. The options that remain are 2, 6 , 10, 14, 18, 22. The goal is to delete all options in the for Code:

var x = 0; 
var select = document.getElementById("hour");
var length = select.options.length;
for (x = 0; x < length; x++) {
    select.options[x] = null;
};

Answer 1

Try looping reversed

var select = document.getElementById("hour");
var length = select.options.length;
for (var x = length-1; x >= 0; x--) {
    select.options[x] = null;
};

Also you may use remove method instead setting it to null value

select.remove(x);

Issue with your code is, when you remove 0th index option then first one comes at 0th index resulting next iteration to delete 1st index instead current first.