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I am not sure how to increase or decrease the location stored property of the Robot class.

Hi there!

I am blanking out and not sure how to implement the method for Robot using the Enum. I am not really sure how I can add or subtract one to Point by applying each member of the enum.

I tried it with an if statement, which I figured wouldn't work.

Thanks!

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) -> Point {
switch direction {
case Direction.down: return Point(x: 0, y: -1)
case Direction.up: return Point(x: 0, y: 1)
case Direction.right: return Point(x: 1, y: 0)
case Direction.left: return Point(x: -1, y: 1)
}
}
}
```

Some hints:

1) The move function doesn't return anything. It just updates the current location.

2) `location.x` stores the current x coordinate for Robot. So

```location.x = location.x + 1
```

or

```location.x += 1
```

would move 1 step to the right.