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// Tuple pattern matching let point = (2, 0) switch point { case (0, 0): print("Origin") case (let x, 0): print("On x-axis at \(x)") case (0, let y): print("On y-axis at \(y)") case (let x, let y): print("At (\(x), \(y))") } // Where clause let value = 42 switch value { case let n where n < 0: print("Negative") case let n where n == 0: print("Zero") case let n where n > 0: print("Positive: \(n)") default: break } // if case with associated values enum Shape { case circle(radius: Double) case rectangle(width: Double, height: Double) } let shape = Shape.circle(radius: 5.0) if case .circle(let r) = shape { print("Circle area: \(Double.pi * r * r)") } // for case let shapes: [Shape] = [.circle(radius: 3), .rectangle(width: 4, height: 5), .circle(radius: 1)] for case .circle(let r) in shapes { print("Circle with radius \(r)") }
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