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    <p>What's happening in the original:</p> <p>Javascript has <a href="http://en.wikipedia.org/wiki/For_loop#Kinds_of_for_loops" rel="nofollow">compound <em>for</em> loops</a>. The declaration inside the parenthesis has three expressions: <code>for(x; y; z){...}</code>.</p> <ul> <li><code>x</code> runs once before the loop</li> <li><code>y</code> is a condition, tested before each iteration. If it's false the loop will stop</li> <li><code>z</code> runs once after every iteration</li> </ul> <p>In this code, you set <code>j = world.m_jointList</code>, which is the first item in the linked list. The middle part of the <code>for</code> loop is checking for <a href="http://11heavens.com/falsy-and-truthy-in-javascript" rel="nofollow">thruthiness</a> of <code>j;</code>, and after each iteration <code>j</code> is set to <code>j.m_next</code>, which is a pointer to the next object in the chain. It ends when <code>j</code> evaluates to false (probably <code>undefined</code> in this case).</p> <p>To visualize that, <code>world</code> could look like this:</p> <pre><code>world = { m_jointList: { value: 'head', m_next: world.foo1 }, foo1: { value: 'foo', m_next: world.foo2 }, foo2: { value: 'foo', m_next: world.tail }, tail: { value: 'foo' } } </code></pre> <p>In reality the items in the list probably don't exist as properties of <code>world</code>, but this would work the same. Notice that <code>m_next</code> is undefined in the last object. Sometimes a placeholder value for the tail will be used indicating the end of the chain.</p> <p>The name <code>m_jointList</code> is also a bit misleading here because it doesn't actually contain the list, just the first element of it.</p> <p>This should do it in coffeescript:</p> <pre><code>j = world.m_jointList while j then drawJoint(j, context); j = j.m_next </code></pre> <p>And that would've been a good use of <code>do...while</code> in javascript:</p> <pre><code>var j = world.m_jointList do { drawJoint(j, context) } while (j = j.m_next) </code></pre>
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    1. USRicardo Tomasi
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    1. COthe first `j` may be `false`
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    2. CO@island205 I was thinking of `do...while` :/ fixed.
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      1. USRicardo Tomasi
    3. CObut do...while like this `do{alert("foo");}while(false);` could exec at least once.
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