How to write this JS function in best(smartest) way?
<p>I would like to write the function which takes file size in bytes(7762432) and return value in user readable format (7,762,432 bytes).</p>

<pre><code>function(fileSizeBytes){
    // mind blowing logic :)
    return userReadable;
}
</code></pre>

<p>I have done it using old school string split way, but i am just curious if there exist way that can blow my head and make me scream with "O god it can be done this way too !!"</p>
