[jQuery] Easier way to iterate?

[jQuery] Easier way to iterate?

I'm a js newbie and already love jQuery
Problem:
I'm trying to go through table rows and assign a class "button" to the last cell. The code below works but it is very slow and hackish. Any suggestions?
$(".stripe tr").each(function(i){
$(".stripe tr:eq("+i+") td:last").addClass("button");
});
Thanks in advance!
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