pattern_matching_shenanigans.swift

enum Quadrant {
    case BottomLeft
    case TopLeft
    case BottomRight
    case TopRight

    static func forPoint(point: CGPoint) -> Quadrant {
        switch (point.x, point.y) {
        case (let x, let y) where x >= 0 && y >= 0:
            return .TopRight
        case (let x, let y) where x >= 0 && y < 0:
            return .BottomRight
        case (let x, let y) where x < 0 && y >= 0:
            return .TopLeft
        case (let x, let y) where x < 0 && y < 0:
            return .BottomLeft
        default:
            return .TopRight
        }
    }

    // Abusing Unit for fun and profit
    static func forPoint2(point: CGPoint) -> Quadrant {
        let (x, y) = (point.x, point.y)
        switch () {
        case () where x >= 0 && y >= 0:
            return .TopRight
        case () where x >= 0 && y < 0:
            return .BottomRight
        case () where x < 0 && y >= 0:
            return .TopLeft
        case () where x < 0 && y < 0:
            return .BottomLeft
        default:
            return .TopRight
        }
    }
}