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val inArray = Array("a", "b", "c", "d")
// ...
val outArray = Array("a1", "a2", "a3", "b1", "b2", "b3", "c1", "c2", "c3", "d1", "d2", "d3")
How to map inArray to outArray?
The idea is to iterate through inArray yielding 3 elements (by concatenating an index in this example) from each of its elements.
You can do that with
flatMap.