Efficiently repeat a character/string n times in Scala

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For strings you can just write "abc" * 3, which works via StringOps and uses a StringBuffer behind the scenes.

For characters I think your solution is pretty reasonable, although char.toString * n is arguably clearer. Do you have any reason to suspect the List.fill version isn’t efficient enough for your needs? You could write your own method that would use a StringBuffer (similar to * on StringOps), but I would suggest aiming for clarity first and then worrying about efficiency only when you have concrete evidence that that’s an issue in your program.

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