NSScreencast Episode #127 Swift Operators

Swift Operators - NSScreencast

SwiftでOperatorを定義 =~

• be guard
• init
  • The Swift Programming Language: Initialization
  • initとfuncで引数の扱いが違う
  • external first argument
    • struct Celsius
      • init(fromFahrenheit fahrenheit: Double)
        • Celsius(fromFahrenheit: 212.0)
      • init(fromKelvin kelvin: Double)
        • Celsius(fromKelvin: 273.15)
  • 暗黙の引数
    • underscore (_) as an explicit external name
    • class Regex
      • init(_ pattern: String)
      • Regex("^\d+$")
        • init(pattern: String) の定義だとエラー
• class Regex
  • func test(input: String) -> Bool {
    • let range = input.rangeOfString(pattern, options: .RegularExpressionSearch)
    • return range.getLogicValue()
• operator infix =~ {}
  • func =~(input: String, pattern: String) -> Bool {
    • return Regex(pattern).test(input)
  • if input =~ "^\d+$" {
• operator infix .. {}
  • func ..(a: Vector, b: Vector) -> Float {
    • return a.dotProduct(b)
  • let result = a .. b
• =~ equal squiggle
  • squiggle 短い不規則な曲線，くねった線
• The Swift Programming Language: Advanced Operators
  • Swift gives you the freedom to define your own custom infix, prefix, postfix, and assignment operators