Swift Array.map closure issue

Edit: Note: This language feature was removed in Swift 2.

A swift-er way than connor's answer (but along the same lines), is to use a curried function. From The Swift Programming Language->Language Reference->Declarations->Curried Functions and Methods:

A function declared this way is understood as a function whose return type is another function.

So you can simplify this:

func multiplier(factor: Double) -> (Int)->Double{    return {  (currentNum: Int) -> Double in        let result = Double(currentNum) * factor        return result    }}

to this:

func multiplier(factor: Double)(currentNum: Int) -> Double {    return Double(currentNum) * factor}

and use it exactly the same way:

let numbersArray = [1, 2, 3, 4, 5]let multipliedArray = numbersArray.map(multiplier(3.5))

You can use a higher order function to produce a custom function that you can then use with the array's map function. Like this:

var numbersArray = [1, 2, 3, 4, 5]func multiplier(factor: Double) -> (Int)->Double{    return {  (currentNum: Int) -> Double in        let result = Double(currentNum) * factor        return result    }}var newArray = numbersArray.map(multiplier(2.5))