swift function uses

• No return value parameter-free function class methods class name Function name calling

    func1 FUNC static () { 
        Print ( "None None Return Value parametric function func1") 
    } 
    ViewController.func1 ();

 

• No argument function has a return value func2

    Print (func2 ()); 
    FUNC func2 () -> String { 
        return "parameter-free function returns a value func2" 
    }

 

• No return value parameter function func3

    func3 (one: "This is my own argument casually pass") 
    FUNC func3 (One: String) { 
        Print ( "there is no return value parameter function func3, parameters: \ (One)") 
    }

 

• There are parameters, return values ​​func4

    print(func4(one: 1, tow: 2));
    func func4(one: Int,tow: Int)->Int{
        return one+tow;
    }

• Multi-parameter return func5

    func func5(array: [Int])->(min: Int,max: Int){
        
        if(array.isEmpty || array.count == 0 ) {
            return(-1,-1);
        }
        var min = array[0]
        var max = array[0]
        for value in array[1..<array.count] {
            if(value < min){
                min = value;
            }
            if(value > max){
                max = value;
            }
        }

        
        return (min,max);
    }

 

    let bounds = func5(array: [6,2,7,9,4,21,243,62]);
    print("min:\(bounds.min) max:\(bounds.max)")

 

• Multi-parameter passed func6

    func func6<N>(members: N...){
        for i in members {
            print(i)
        }
    }

 

      func6(members: 1,2,3);
      func6(members: 1);