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

You need to provide an implementation for the move method

Why does this say "You need to provide an implementation for the move method" ?

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 .up: location.y += 1
            case .down: location.y -= 1
            case .right: location.x += 1
            case .left: location.x -= 1
        }

        print(location.x, location.y)
    }
}

let player = Robot()
player.location = Point(x: 33, y: 2)
player.move(direction: .up)
player.move(direction: .down)

1 Answer

David Papandrew
David Papandrew
8,386 Points

The starter code for the challenge has an underscore for the external parameter name which you omitted in your code. Change the following line and the code should pass:

    func move(_ direction: Direction) {

Woops, silly me thx David!