Test case details

Preparation Code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> <script src="http://documentcloud.github.com/underscore/underscore-min.js"></script> <script>   var a = ['a', 2,   {    c: true   }] </script>

Test cases

Test #1

_.each(a, function(value, key) {  '' + key; });

Test #2

jQuery.each(a, function(key, value) {  '' + key; });