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Are poor performance fast?

Swift offers the ability to write extensions. I do this to make my code more readable. Not sure if they are harmless. I am wondering if it would be better to just skip extensions due to performance reasons?

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Apple encourages the use of extensions. You can read more about them in the Swift documentation here .

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, . extension , . performSelector, , , .

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Source: https://habr.com/ru/post/1609848/

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