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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enums and Objects

surya m
surya m
404 Points

Enums excercise

classes.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) {
        // Enter your code below
        switch direction {
        case Direction.Up :  Point(x: 0, y: 1)
        case Direction.Down : Point(x: 0, y: -1)
        case Direction.Right : Point(x: 1, y: 0)
        case Direction.Left : Point(x: -1, y: 0)
        }
}

1 Answer

Greg Kaleka
Greg Kaleka
39,021 Points

Hi Surya,

You're almost there. What you're doing in each case, though, is creating a new point with specific coordinates. Instead, what you should be doing is changing the x and y coordinates of the robot's location. For example, to move the robot right, you would set:

self.location.x += 1

Does that make sense? I think you can take it from there!

Best,

-Greg

surya m
surya m
404 Points

thank you Greg!