Switch Statement trong Swift (Pattern Matching)

let day = 3
 
switch day {
case 1:
    print("Monday")
case 2:
    print("Tuesday")
case 3:
    print("Wednesday")
default:
    print("Other day")
}

let day = 6
 
switch day {
case 1, 2, 3, 4, 5:
    print("Weekday")
case 6, 7:
    print("Weekend")
default:
    print("Invalid")
}

let score = 85
 
switch score {
case 90...100:
    print("A")
case 80..<90:
    print("B")
case 70..<80:
    print("C")
case 50..<70:
    print("D")
default:
    print("F")
}

let point = (0, 0)
 
switch point {
case (0, 0):
    print("Origin")
case (_, 0):
    print("On x-axis")
case (0, _):
    print("On y-axis")
default:
    print("Somewhere else")
}

let point = (2, 0)
 
switch point {
case (let x, 0):
    print("On x-axis at x = \(x)")
case (0, let y):
    print("On y-axis at y = \(y)")
case let (x, y):
    print("At (\(x), \(y))")
}

let point = (1, 1)
 
switch point {
case let (x, y) where x == y:
    print("On diagonal")
case let (x, y) where x == -y:
    print("On anti-diagonal")
default:
    print("Off diagonal")
}

enum Direction {
    case north, south, east, west
}
 
let direction = Direction.north
 
switch direction {
case .north:
    print("Go north")
case .south:
    print("Go south")
case .east:
    print("Go east")
case .west:
    print("Go west")
}

let number = 5
 
switch number {
case 5:
    print("Five")
    fallthrough  // Tiếp tục case tiếp theo
case 4, 6:
    print("Near five")
default:
    break
}