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

Em Har
Em Har
9,775 Points
Posted by Em Har
Em Har
9,775 Points

In the editor below you have two objects - classes named Point and Robot. The Robot stores its location as a point insta

Can someone walk me through my issue on this?

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) {
        // Enter your code below
      switch direction{
      case Direction.up: return location.y +=1
      case Direction.down: return location.y -=1
      case Direction.right: return location.x +=1
      case Direction.left: return location.x -=1
      }
    }
}

1 Answer

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Hello,

So the basic thing to do here is a "switch" within the "move" method. And you want to switch on the method's parameter "direction". 

 // This goes inside the "move" method.

      switch direction {
        case .up: 
        location.y += 1
        case .down:
        location.y -= 1
        case .right:
        location.x += 1
        case .left
        location.x -= 1
        default: break
      }

Here what we are doing is checking every possible "direction", and adding a point to location.

If you need more help please reply to this threat.

Good luck