Swift Tutorial 1

Swift Tutorial 1

• 1.
  Swift Tutorial -1 Jintin
• 2.
  Feature • Modern • StaticLanguage • Type Safety & Inference • Objective-C Compatible • Open Source
• 3.
  Hello World print(“Hello, world”)
• 4.
  Const vs Variable vara = 1 a = 2 let b = 1 b = 2 // error
• 5.
  Type Safe var a:Int = 1 var b: Double = 1.1 var c: [Int] = [1, 2, 3] var d: String = “hello” var e: Int = 1.1 // error
• 6.
  Type Inference var a:Int = 1 var b = 1 // b is Int too
• 7.
  Optional var a: Int= nil // error var b: Int? = nil
• 8.
  Optional var a: Int= 1 print(a) // 1 var b: Int? = 1 print(b) // Optional(1)
• 9.
  Unwrapped Optional var b:Int? = 1 print(b) // Optional(1) print(b!) // 1
• 10.
  Control Flow: if ifa == 1 { print(“a = 1”) } else { // do something }
• 11.
  Control Flow: iflet var a: Int? = 1 if let b = a { print(b) }
• 12.
  Exercise // print “Hello,[name]” if name not nil, else print “Hello there.” var name: String?