Springy is my entry to JS1k 2013. It's a simple Doodle Jump clone, written in less than 1kB of JavaScript. You can play it here.
Simply move the mouse to the left or right to control the spring. Bounce on the platforms and see how high you can get. The white platforms are normal, and the gold platforms give you an extra bounce!
The whole point of JS1k is to make a little demo, usually involving the HTML5 <cavnas> element, in under 1024 bytes of JavaScript.
To get Springy down to its tiny little size (the minified script is only 981 bytes), I had to employ various nasty tricks, so reading the source code is not the nicest experience.
If you want to generate the minified file from the source, follow these simple steps:
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Run it through the Google Closure Compiler in advanced mode
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Run the output through UglifyJS
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Remove the commented-out parts of the following snippet from the output (these are all non-initialised variable declarations that must remain in the unminified source so Closure can rename them. If they're removed, they can't be automatically renamed as they're properties of the global object):
/*var */e=c.width=320,f=c.height=500,g=0,h=0,j=Math.random,k=7,l=[],m=70,n=20,p="fillStyle"/*,q,r,s,t,u,v,w,x,z,i,A*/;- Find the single occurrence of each of the following snippets and make the appropriate change (this is necessary because Closure compiler gets confused around the
withstatement and ends up renaming some object properties when it shouldn't):
b:1>6*j() // Change `b` to `t`
a:-1|3*j() // Change `a` to `d`- Remove the trailing semi-colon from the end of the output