Swift Basics 1

gistfile1.txt

// Playground - noun: a place where people can play

import Foundation

var greetings = "Hello"

greetings = greetings + "World"
greetings.append(Character("!"))
println(greetings)


// Swift string is a value type, as a result when you assign a string to a variable, a constant, or pass it as an argument to a function, its value is copied.

// In swift you can use Objective C methods by importing appropriate Header files; for example if you import Foundation then you can use the NSString functions with the swift string type

// let keyword is a constant type in swift while the var keyword is the variable type means you can change the value of the variable 

// Swift does not need the semicolon 

// Compiler can determine the size of the byte if the app runs on the 32 bit it will consider it as a 32 byte and if it runs on the 64 bit it will consider it as a 64 byte.

// You can use the underscore as a thousands separator.  let million = 1_000_000

// You cannot to arithmatic operation with different type variables. all the variables should have the same type and cannot be implicitly converted as it can be in the Objective C

// Tuples can be access via their indices

// String interpolation means that you can embed values when you use println() method using \().

// for loops :

//var i in 1...5 
//var i in 1..<6
//for i in "Swift" {
//    println("\(i)")
//}

// switch