Interview iOS

print("iOS implementation about closure")
let double = { (i: Int) -> Int in
    return i * 2
}

let result = [1,2,3,4].map(double)  //  [2,4,6,8]
print(result)

//MARK: https://medium.com/hash-coding/swift-functions-closure-part-i-e339faa51ffc
let someFunction: (Int, Int) -> Int = { $0 + $1 }