Question

This works but of course is a bit redundant. Items can also be dynamically added so I need to have it always increment by one. What is a better way to write this into one function?

Update: Just added the markup. Bascially when a user hovers any of the list item a classname should be attached to the banner div. e.g., banner_0, banner_1, etc.

<ul id="list">
    <li><a href="#" data="">item1</a></li>
    <li><a href="#" data="">item2</a></li>
    <li><a href="#" data="">item3</a></li>
    <li><a href="#" data="">item4</a></li>
    <li><a href="#" data="">item5</a></li>
    <li><a href="#" data="">item6</a></li>
    <li><a href="#" data="">item7</a></li>
</ul>

<div id="banner" class=""></div>


$('#list a').eq(0).hover(
function() {
    $('#banner').addClass('banner_0');
}, 
function() {
    $('#banner').removeClass();
}
);

$('#list a').eq(1).hover(
function() {
    $('#banner').addClass('banner_1');
}, 
function() {
    $('#banner').removeClass();
}
);

$('#list a').eq(2).hover(
function() {
    $('#banner').addClass('banner_2');
}, 
function() {
    $('#banner').removeClass();
}
);

$('#list a').eq(3).hover(
function() {
    $('#banner').addClass('banner_3');
}, 
function() {
    $('#banner').removeClass();
}
);

Answer 1

Try using .index like below,

$('#list a').hover(
function() {
    $('#banner').addClass('banner_' + $(this).index());
}, 
function() {
    $('#banner').removeClass();
}
);