I was using KnockoutJS to loop through and display some data. I wanted to apply some alternate formatting on every other row. I used this syntax containing the MOD operation to achieve the formatting I wanted.
<!-- ko if: $index() % 2 === 0 -->
The other thing I learned was that $index() is observable, so I can +1 it? I believe that is right.
The following were some sources that clued me in:
http://jsfiddle.net/KuJBv/11/
https://groups.google.com/forum/#!msg/knockoutjs/ElVix0ksXh8/awkTFYewitAJ
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