JQuery index of element

TASK:
Recognize index of element in group on which we clicked.
SOLUTION: 
$("#parent child").index(this);
EXAMPLE:

JQuery

$(document).ready(function() {

    $("#example div").click(function() {
        var index = $("#example div").index(this);
        $("#example_index").html("Index " + index + " was clicked");
    });

});

HTML

<div id="example">
    <div>div index 0</div>
    <div>div index 1</div>
    <div>div index 2</div>
    <div>div index 3</div>
    <div>div index 4</div>
</div>
<div id="example_index">Click one of the above divs</div>