Simple Values

- 상수 : let

  let myConstant = 42

     

  let implicitInteger = 70

  let implicitDouble = 70.0

  let explicitDouble : Double = 70

- 변수 : var

  var myVariable = 42

  myVariable = 50

- 형변환

  let label = "The width is "

  let width = 94

  let widthLabel = label + String(width)

- 문자열에 변수값을 포함하는 방법 : \(value)

  let apples = 3

  let oranges = 5

  let appleSummary = "I have \(apples) apples."

  let fruitSummary = "I have \(apple + oranges) pieces of fruit."

- arrays 와 dictionaries 만들기 : []

  var shoppingList = ["생선", "물", "쌀", "화장지"]

  shoppingList[1] = "물병"

  

  var occupations = ["홍길동": "소설주인공", "이순신": "장군", ]

  occupations["Jayne"] = "Public Relations"

  

- array 또는 dictionary 초기화

  let emptyArray = String[]()

  let emptyDictionary = Dictionary<String, Float>()

  

  shoppingList = []

  cooupations = [:]

참고 : Apple Inc. ‘The Swift Programming Language.'