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If map() is part of the language then it's not difficult to understand because you can always read up on it in official documentation or on the web. But if the language does not support it and you create your own it is unlikely that you document it as well as the vendors of a programming language.

This may be part of the problem with hyper-productive languages in general, you get stuff done fast but it tends not to be documented as well as a publicly available programming language.

map() that is part of the language is also very STABLE whereas if you write your own you are likely to tinker with what it does here and there, what default argument-values it uses and so on.




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