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    It's Codewars, you can't those ratings too seriously. People just like to see short one liners regardless of readability and efficiency.

    Sometimes you can learn interesting tricks from them too.

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    It is definitely not recommended. It looks clever but that's it. When you work with other developer, readability is more important. I just think it is a cool way to solve problem. But it could also mean code efficiency, eg your code use less variable etc. I could be wrong.