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When you know in what ways it is different from other languages, and you would be able to write an application in it without needing to rely on any kind of documentation/auto-complete all that much?
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When they can solve a problem on projecteuler.net using optimized brute force in that language.
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mhudson12858yJust like foreign languages, there's 3 levels of knowing:
-can read it
-can write/speak it
-can think in it
More of a spectrum, than a door one walks through. -
From seeing my mate code. I think its not about knowing A language. Its about knowing the intrinsics of it languages. So you can study an unknown language and graps it ina few days study.
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