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iOS Build a Simple iPhone App with Swift 2.0 Getting Started with iOS Development Swift Recap Part 2

Stuart Lawrence
Stuart Lawrence
2,627 Points

My code for Robot works in playground but not in the editor

I've created the Robot sub class and tried & tested the code by declaring an instance of Robot in the playground. The values of x and y increment and decrement correctly when the relevant argument is sent eg: let newRobot = Robot() newRobot.move("up") print (newRobot.location.y) gives an answer of 1. But in the editor I get this error - :Double check your implementation for the up direction and make sure the location's y property increases by 1!

Please help!! Thankyou.

class Point {
    var x: Int
    var y: Int

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

class Machine {
    var location: Point

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

    func move(direction: String) {
        print("Do nothing! I am a machine!")

// Enter your code below
class Robot: Machine {

    override func move(direction: String) {
        switch direction{

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

        default: break



2 Answers

Stuart, so close!! The Strings Up, Down, Left and Right in your switch statement need to be capitalized.

Stuart Lawrence
Stuart Lawrence
2,627 Points

Thank you jcorum, I must read the question more carefully!

Much Appreciated.