Does jQuery re-query the DOM when $(this) is called?

Question

In the following code, when $(this) is called, does jQuery re-query the DOM as though a selector has been passed to it (using some property of the object as a selector), or does jQuery retain the previously returned object?

$('.someButton').on('click', function() {
    $(this).remove();  // Is this another lookup, or just a wrapper for the previously returned object?
});

Answer 1

It doesn't re-query the DOM, this is already an element. jQuery simply sets the context to the element, adjusts the length, and returns itself. This code is from the init function, which runs when you do $(something), this is part of a big if..else statement, where it also checks for selectors, arrays among other things:

// HANDLE: $(DOMElement)
} else if (selector.nodeType) {
  this.context = this[0] = selector;
  this.length = 1;
  return this;

So basically it just wraps the element in a new jQuery object.