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What's the most smartly written piece of JavaScript code you've ever seen?

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Define “smartly written”. A good JavaScript programmer can write about two lines of code, using the latest ECMAScript, that does the work of ten or twenty lines of code by a mere mortal. But he’d better be working on a project that nobody else will ever need to support. So that’s...
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Define “smartly written”. A good JavaScript programmer can write about two lines of code, using the latest ECMAScript, that does the work of ten or twenty lines of code by a mere mortal. But he’d better be working on a project that nobody else will ever need to support.

So that’s smart in one sense, dead-ended in another.

The same can be said in reverse, for very conventional coding styles.

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