Learning Swift

swift

//Uses LLVM compiler just like Objective C.

//optional: variables that may not be used. contains null.

import UIKit

//variables
var str = "Hello, playground"
var myInteger = 90; //semicolon is optional
var boolExample = true //or false
println("The array is: \(myInteger)");


//constants
let myConstant = 100;


//arrays
//heterogeneous arrays work as NSArrays.
//some of these methods didnt work in that.
var myArray = ["Red", "Blue"];
println("The array is: \(myArray[0])");
println("The array size is: \(myArray.count)");
println("The array size is: \(myArray.last)");
myArray.insert("Now at first", atIndex: 0);


//dictionary
var myDictionary = ["country": "India", "state": "Tamil Nadu", "city": "Chennai"];
println(myDictionary["country"])

//control statements
if(myInteger == 90){
    println("hello");
}

for i in 0...1
{
    println("\(i)");
}

for element in myArray{
    println(element);
}

var myChar = "h"
switch(myChar)
{
    case "a", "e", "i", "o", "u": println("vowel"); break;
    case "b": println("b"); break;
    case "h": println("ee"); fallthrough; break; //break will never execute
    //fallthrough also considers others case statements till next break;
    case "d": println("d"); break;
    case "e": println("e"); break;
    default: println("haha");
}