스위프트 : 중첩함수를 사용한 캡쳐링

nested_function_with_capture.swift

func makeAddingClosure(start:Int)->(Int)->(Int) {
    var total = start
    
    func add(num:Int)->Int {
        total = total + num
        return total
    }
    return add
}

let capturedNestFunction = makeAddingClosure(10)
capturedNestFunction(1)
capturedNestFunction(8)
capturedNestFunction(15)