Question: ```
<div class='hide'>A</div>
<div class='hide'>B</div>
<div class='hide' id='1'>C</div>

```

I have a function called showOne which should hide all elements and then show the one with id='1'.

```
function showOne(id) {
// Hide all elements with class = 'hide'
$('#'+id).show();
}

```

How do I hide all elements with class = 'hide' in jquery?

Answer: 
Try something like:

```
function showOne(id) {
    $('.hide').not('#' + id).hide();
}

showOne(1);​

```

Demo: <http://jsfiddle.net/aymansafadi/kReZn/>

I agree with @TheSystemRestart though, "NOTE: DON'T USE ONLY NUMERIC ID".
I'm almost ashamed of how easy the solution was and that I found it just after writing the question. Just:

```
$('.hide').hide();

```