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Nice. Probably the shortest solution.
$& means here a special character combinations to insert the whole match (which is an uppercased letter in out case). And of course we prepend each uppercased letter with a space
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
reviewing the code, it got a bit confusing, i will practice refactoring to apply the solution with recursion
Good and clear solution.
But I prefer not to mutate function arguments such as objects and arrays. It can lead to unexpected results outside the function. But for this kata it is OK.