Christian Dietrich Christian Dietrich - 1 year ago 170
Swift Question

Flatten a Array of Arrays in Swift

Is there a counterpart in Swift to

in Scala, Xtend, Groovy, Ruby and co?

var aofa = [[1,2,3],[4],[5,6,7,8,9]]
aofa.flatten() // shall deliver [1,2,3,4,5,6,7,8,9]

of course i could use reduce for that but that kinda sucks

var flattened = aofa.reduce(Int[]()){
a,i in var b : Int[] = a
return b

Answer Source

There's no flatten method in the Swift's default functions. Checkout ExSwift, it implements flatten as an extension on Array.


I'm aware that this answer has collected so many negative votes. It was written less than a month after Swift was announced, and nobody really knew much about it. We now have a flatMap method in the standard library. So we can use it to flatten an Array of Arrays:

array.flatMap { $0 }
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