Convert nested array in swift to single dimensional array

Question

I have a structure like [[[ ]]] which I want to convert to [].

E.g. [ [ [ \"Hi\" ] ] ] into [ \"Hi\" ]

How

Answer 1

This is exactly what flatMap() does:

let arr = [ [ [ "A", "B" ], ["C"] ], [ [ "D", "E" ], ["F"] ] ]

// each call reduces the array by one dimension

let flattened = arr.flatMap{$0}.flatMap{$0}

// returns ["A", "B", "C", "D", "E", "F"]