[removed] querySelector Null vs querySelector

Question

What is the main difference between these two methods of referencing?

What are the benefits of using one or the other? Also what kind of usage-case would they each

Answer 1

You can try to avoid the conditional statement with:

var selection = document.querySelectorAll('.selector');
selection.forEach(function(item) {
    alert(item);
});

Caution! querySelectorAll() behaves differently than most common JavaScript DOM libraries, which might lead to unexpected results

Source: https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll