Swift switch value bindings

swift-switch-value-bindings.swift

/// Wind speed with direction
enum WindSpeed {
  case north(Double)
  case east(Double)
  case south(Double)
  case west(Double)
}

let direction = WindSpeed.north(3.6)

// Switch with value binding before matching pattern
switch direction {
case let .north(speed):
  print(speed)
default:
  print("default")
}

// Switch with value binding inside matching pattern
switch direction {
case .north(let speed):
  print(speed)
default:
  print("default")
}