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    <blockquote> <p>First, why would DiggWidget ever be a function?</p> </blockquote> <p>It will become a function when the asynchronous script loads and executes</p> <blockquote> <p>Is DiggWidget (the array) available to that .js</p> </blockquote> <p>Yes, <code>window.DiggWidget</code> is global so it's available to that script.</p> <p>The way the widget works is rather simple. </p> <p>If the <code>DiggWidget</code> script has not been loaded yet, then <code>window.DiggWidget</code> will not be a function. Initially it will be an undefined variable so the else block </p> <pre><code>} else { DiggWidget = [diggWidget]; </code></pre> <p>executes and defines it as an array. From now onwards and until the widget script loads, it will be defined as an array.</p> <p>Now until the <code>DiggWidget</code> script loads asynchronously, keep pushing all initialization objects <code>{..}</code> to an array of the same name - <code>window.DiggWidget</code>.</p> <p>When the script is loaded, before it overtakes the global <code>DiggWidget</code> variable it sees the objects in that array, and safely records it somewhere else. Then takes over the DiggWidget name, loops through each object, and initializes the widget for each.</p> <p>Here's the full embed code annotated with comments.</p> <h3>User code</h3> <pre><code>(function () { var s, s1, diggWidget = { id: "digg-widget-1282651415272", width: 300, display: "tabbed" }; // either the external widget script has already loaded, or there is more than // one widget to be embedded on the page, and the previous widget's embed code // defined this variable if (window.DiggWidget) { // the external widget script has been loaded asynchronously // because DiggWidget is a function. Can directly create a new object. if (typeof DiggWidget == 'function') { new DiggWidget(diggWidget); } // a previous widget's embed code defined this global array. Remember the // widgets initialization settings for when the external script loads. else { DiggWidget.push(diggWidget); } } // the external widget script has not loaded yet and // this is the first widget ever to be embedded on the page else { // DiggWidget does not exist at this point. So make it an array // and store the first widget's config object in it DiggWidget = [diggWidget]; s = document.createElement('SCRIPT'); s.type = 'text/javascript'; s.async = true; s.src = 'http://widgets.digg.com/widgets.js'; s1 = document.getElementsByTagName('SCRIPT')[0]; s1.parentNode.insertBefore(s, s1); } })(); </code></pre> <h3>Widget code (at the top)</h3> <pre><code>(function () { var A; // global DiggWiget is defined. it will either be an array if // the widget code hasn't loaded yet, or a function if it has if (window.DiggWidget) { // it's an array, so keep that array somewhere safe // because we are gonna take over the DiggWidget variable purdy soon if (typeof DiggWidget != "function") { A = DiggWidget } // window.DiggWidget must be a function // there is no widget to initialize, just return else { return } } </code></pre> <h3>(at the bottom)</h3> <pre><code> // A is the array of widget settings we backed up a little earlier if (A) { // loop through each config object and create the actual // widget object while (A.length) { new DiggWidget(A.shift()) } } </code></pre>
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    1. COAh ok, thanks. I thought DiggWidget was a local variable, different from window.DiggWidget. But since it's not initialized (no var = ) I guess it's a global variable. Makes sense. Thanks! (would upvote but this is a new account) Btw, isn't it wrong not to initiliaze that DiggWidget {} somewhere?
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    2. CO@wesleyh - Not sure if I understand your question, but they are storing that local `diggWidget` config object `{..}` in the global `DiggWidget` array. I know it's kinda confusing :) Added the widget embed code with comments for more detail.
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    3. COHot damn, thanks for all the commenting. Explains it very clearly. What I was saying is that I initially thought DiggWidget = [diggWidget]; would create a local variable because of the anonymous function it is in, but it's global due to not having the var = Anyway thanks a ton!
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