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I tested 3 JS solutions. They all work. One test case sometimes fails {5,4}, but that one is known to fail (see comment section).

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Reraised as issue

Superstrings. Title / description should be updated. Raising a Suggestion.

fixed

See above issue

It's the same in all language versions.

Ruby tests still appear broken, still getting the above issue. inserting a puts to output the parameters passed doesn't produce any output so it looks like my code isn't even getting called.

there are mistake in this row
func swap(_ s: String,_ n: Int) -> String {

I think js tests are still not correct.

Fixed

But you could. Closing.

Thank you, I'll look into it. Also, I allowed contributors, so feel free to edit if you find the issue. :)

np