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

Michael DeCroce-Movson
Michael DeCroce-Movson
4,277 Points

The error says "You must deploy an implementation for the move method"

But when I use it in xcode, it's totally functional. Why?

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

1 Answer

David Papandrew
David Papandrew
8,386 Points

I see that in the initial code the exercise offers, there is an underscore for external name for the move function's direction parameter. If you add that back to your code, it passes (I tried it).

This is the specific line you need to modify:

    func move(_ direction: Direction) {

Hopefully that will work for you.