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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enums and Objects

Posted by Raju Ramesh
Raju Ramesh
307 Points

Enumrations

There are no compilation errors but while rechecking the work it's giving the error like "In the up direction increase the y coordinate by 1", but in the code it already increased

test.swift 
class Point {
    var x: Int
    var y: Int

    init(x: Int, y: Int) {
        self.x = x
        self.y = y
    }
}

enum Direction {
    case left
    case right
    case up
    case down
}

class Robot {
    var location: Point

    init() {
        self.location = Point(x: 0, y: 0)
    }

    func move(_ direction: Direction) {
        switch direction {
        case .left:
            location.x - 1
        case .right:
            location.x + 1
        case .up:
            location.y + 1
        case .down:
            location.y - 1

        }

    }
}

1 Answer

JORGE SANJUAN PEREZ
JORGE SANJUAN PEREZ
4,025 Points
JORGE SANJUAN PEREZ
JORGE SANJUAN PEREZ
4,025 Points

you should change the value of location, in your code you are making an operation, but you are nota assigning the result to any variable.

func move(_ direction: Direction) { switch direction { case .left: location.x = location.x - 1 case .right: location.x = location.x + 1 case .up: location.y = location.y + 1 case .down: location.y = location.y - 1

    }