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kotlinlang

Does anyone know why map on arrays returns a list and not an array?

`map`  always returns a `List`, regardless of input. `map` on a `Set` also returns a `List.`

For `Set` it’s probably forced because multiple values could be mapped to the same one and they didn’t want to have the number of elements change within a `map` operation.
On Array, it’s probably to avoid to have to reimplement all the operations present on Iterable???

I guess they could have implemented specific methods for each use case and not a general `Iterable` one but that ship might have sailed as other parts of the api could expect map to return a `List`

I was scratching my head when after a `map`  operation I had to convert back to an array for my use case.

you have toXArray() on Collection for all primitive Java types (`X` = Boolean, Char and all the number types), so you can easily repackage the result of your map-operation in a new array (I guess normal objects shouldn’t be packed into arrays anyway!?)