Chapter 6 (Apple iOS programming): The Swift Programming Language

WIKI Article Swift_(programming_language)
IBM Swift Sandbox, online Swift compiler and execution

//my hello world/loop
var str="Hello world!";
for i in 0..<10 i="" pre="" print="" str="">

//Rectangle Class example

import Foundation

class Rectangle {
    var length = 0
 var width = 0
    
    init(length: Int, width: Int) { // Constructor
        self.length = length
        self.width = width
    }
 var Area: Int{
  return length*width
 }
 
 func getArea() -> Int {
  return length*width
 }
}

let rect1 = Rectangle(length: 10, width: 10)
print(rect1.Area)              // access the property
print(rect1.getArea())