jQuery select all except last

Question

Using jQuery how can you select all elements but the last?

<div class='elem'>1</div>
<div class='elem'>2</div>
<div class='elem'>3</div>

For example I want hide div's 1 and 2, but keep three.

Answer 1

$("div.elem:not(:last)").hide();

or

$("div.elem").not(":last").hide();

Answer 2

You can hide by nth-child of element as defined below.

$("div.elem:not(:nth-child(3))").hide();