I need to be able to get the width of elements from an array
HTML
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You can also do something like this using nth-child:
$("#container li:nth-child(1)").width(); // first li
You can use .eq function like below,
$array.eq(2).width()
DEMO: http://jsfiddle.net/8zvkn/2/
$array[2] - returns DOM element but what you need is the jQuery object which has the .width function.
Use eq :
$('#container li').eq(i)