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    <blockquote> <p>a. How best to remove the global variables using </p> </blockquote> <p>Wrap it in an anonymous function and assign it to the form as a submit listener.</p> <blockquote> <p>b. jsLint recommends "use strict", so I added it, but im not sure what it does. any good ref's? </p> </blockquote> <p>Don't bother. It's just a buzz-word for those trying to be hip. You can't use strict mode features on the general web because way too many browsers don't support them. You can use it with otherwise compliant ES 3 code, but it's only useful as a debugging tool for errors that should have been found during testing anyway (e.g. calling constructors without new).</p> <p>No c?</p> <blockquote> <p>d. Generally, feel free to rip this code apart (cuz I AM trying to learn) but please explain my errors in noob-speak :)</p> </blockquote> <pre><code>&gt; $rdoGroup = [], // an empty array which will be used to hold </code></pre> <p>You seem to be using $ to indicate a variable that references a jQuery object, but <em>$rdoGroup</em> is just an array. That may be confusing later.</p> <pre><code>&gt; $rdoGroup.push($(this).attr("name")); </code></pre> <p>The $ function is very expensive, don't use it if you don't need to. Standard HTML attributes are available in all browsers as DOM properties, so:</p> <pre><code> $rdoGroup.push(this.name); </code></pre> <p>Is up to 100 times more efficient, depending on the browser.</p> <pre><code>&gt; for (i = 0; i &lt; $rdoGroup.length; i++) { &gt; if ($rdoGroup[c].toString() !== $(this).attr("name").toString()) { </code></pre> <p>The values assigned to <em>$rdoGroup</em> are strings, calling their <em>toString</em> method is redundant.</p> <p>As above, use <code>this.name</code>. The name property is a string, so no need for <em>toString</em>.</p> <p>I think the exercise would be easier without jQuery, which seems to be getting in the way far more than helping. If you are trying to learn javascript, I'd suggest that you learn javascript without using any library. </p> <p>Once you are reasonably confident with using javascript, then you are far better equipped to use a library for the things the library is good with, and not using it for the things it isn't good at.</p>
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    1. CO+1 for suggesting that JS should first be learned without a library involved (I should have said that myself...)
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    2. CO@RobG "The $ function is very expensive, don't use it if you don't need to...." I gotta get my head around this. I understand what your are saying but WHY exactly is it so expensive? Thanks for the code review. Im on it! You guys are the greatest!
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    3. COCreating a jQuery object is expensive because it's a function call that returns an object, it does quite a bit of work setting up the object's properties. So only create them when you really need to, and keep references to them if they are to be re-used. Plain DOM methods ar always faster so use them if it's convenient. Here's a quick [dollar-cost](http://jsperf.com/dollar-cost) example on jsperf.
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