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

Posted by Bala Selvam
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Bala Selvam
Python Development Techdegree Student 30,590 Points

Hey guys i have no idea what I am getting wrong here. Can someone help me out with this?

The video to this example is not really making much sense for me and I feel like I am missing one step. Need Help!

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

let flattenedNumbers = numbers.flatMap