Nested Function with Return Values
func operate(symbol: String) -> (Int, Int) -> Int { // inner function to add two numbers func add(num1:Int, num2:Int) -> Int { return num1 + num2 } // inner function to subtract two numbers func subtract(num1:Int, num2:Int) -> Int { return num1 - num2 } let operation = (symbol == "+") ? add : subtract return operation } let operation = operate(symbol: "+") let result = operation(8, 3) print("Result:", result)