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Writing medium-sized projects in Javascript, I often look toward the sky and thank the originators of that language that they had the foresight to include closures and first class functions. I use them all over and save a significant amount of effort. Because my time is extremely limited, they make things possible I couldn't otherwise do.

If there are a handful of problems where they're the perfect solution, then any language should have them, simply because the overhead in implementation and linguistic style is so low.

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