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14814810
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2013-02-11T15:05:18.243
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2013-02-12T07:36:59.903
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2013-02-12T07:36:59.903
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text
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<blockquote> What is a finite state machine? </blockquote> It is a way of declaring events and side effects of transitioning between them. <blockquote> What are some practical uses of finite state machines? </blockquote> Instead of code like this: <pre><code>function decide() { if(mouseButtonIsDown && mouseIsMoving && mouseCoordinatesAreWithin(0, 0, 100, 100) && thePixelIsRed) { clearBuffers(); startPlaying(); cursorBecomeHand(); } else if(!mouseButtonIsDown && !mouseIsMoving && mouseCoordinatesAreWithin(0, 0, 100, 100) && thePixelIsRed) { } // more ifs } </code></pre> You keep only a few states and break your events into functions, defining what happens in which state. <pre><code>function drag_started() { switch(your_state) { case "within_box": clearBuffers(); cursorBecomeHand(); your_state= "playing"; startPlaying(); break; } </code></pre> } Which leads to the separation of states and events, which means less regressions and more maintainability. <blockquote> When would I not want to use an finite state machine? </blockquote> Answers itself at this point. If you just have one state, don't bother with a state machine. <blockquote> What books, articles, tutorials, etc., offer a more in-depth look at finite state machines (in JavaScript)? </blockquote> Against the academia, I recommend reading the source for jquery plugins. For example look under _mouseMove and _mouseUp in <a href="http://code.jquery.com/ui/1.10.0/jquery-ui.js">the jquery ui source</a>
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1. POWhat is a Finite State Machine and What is it Used For?
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