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iOS Closures in Swift 2 Building Standard Library Functions Using Flat Map

Code Challenge

I'm lost on what to do after this or if this is even right

let numbers = [[1,2,3], [4,5,6], [7,8,9]]

let flattenedNumbers = numbers.flatmap

1 Answer

David Papandrew
David Papandrew
8,386 Points

You may have already solved, but here is the answer:

Note, make sure you type "flatMap" not "flatmap"

let numbers = [[1,2,3], [4,5,6], [7,8,9]]
let flattenedNumbers = numbers.flatMap{ $0 }

I got it now! Thank you!