Programers moving to swift3 that knows other languages – Software Developer Migration Guide to iphone swift3 Apps

do you know how to programing and like to developer Iphone apps software with swift 3 language ?

    var num = 100
    var str = "sdfsdf"
    var str1: String
    var num1: Int
    var num2 = 3
    var num3 = 15.34
    var total = Double(num2) + num3
    //switch
    let speed = 5
    switch speed {
    case 0...3:
        print("it's safe")
    default:
        break
    }
    //for loop
    //insted of for var i = 0; i <100; i++
    //do:  for each-item in some-collection
    for index in 1...100 {
        total
        print (index)
    }
    //** for index in 0 ..<100    -->do 0-99
    //function --> totaly different from other languages --> relavent to class also
    ////////////////////////////////////////////////////
    func myFunction(name : String, age : Int){     //all are constent (let) and not varible (var), you can add var before
        print("hi \(name), \(age)")
    }
    myFunction(name: "Person", age: 21)
    // function/class return values
    func myFunction2() -> String {
        return "hi"
    }
    // function/class default parameter values
    func myFunction3( name : String = "John Due") {
        print(name)
    }
    myFunction3() //using the default value
    myFunction3(name: "myName") //using my call provide name