jQuery - find last class on the element

Question

How to find last class on the element without knowing exact number of classes?

Our element:

 
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Answer 1

var classStr = $('div').attr('class'),
    lastClass = classStr.substr( classStr.lastIndexOf(' ') + 1);

DEMO

As classStr contains class names separated by a single space, so lastIndexOf(' ') will find the last space and make partition from there and give you the last class name.

Answer 2

The simplest solution is to use pop, which accesses the last element in the array.

var lastClass = $('div').attr('class').split(' ').pop();

Note that pop also removes the element from the array, but since you aren't doing anything else with it, that's not a problem.