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`Join` is just like Array.join. It takes an input array and a separator and it returns a string where that separate is put between every item of the array.

00:00 description of the challenge
01:04 attempt at a solution
06:38 all tests pass
07:45 alternatives

You can view the code for this challenge on GitHub: https://github.com/type-challenges/ty.... You can also view the umbrella issue with code for all the challenges we've solved here: https://github.com/type-challenges/ty...

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