Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Swift Recap Part 2 in Build a Simple iPhone App with Swift 3

Line 19 is not running correctly with the single quote in the double quote. It's messing up the rest of the code, so I had to remove the single quote to make it work. Someone might want to fix it.

robots.swift
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'm a machine!")
  }
}

// Enter your code below

4 Answers

Kyle Johnson
Kyle Johnson
33,528 Points

Here is one correct answer.

class Robot: Machine {
  override func move(_ direction: String) {
    switch direction {
      case "Up":
        location.y += 1
      case "Down":
        location.y -= 1
      case "Left":
        location.x -= 1
      case "Right":
        location.x += 1
      default:
        break
    }
  }
}

You need to escape the apostrophe. Just put a backslash before the apostrophe in the print statement.

Zach Lorber-Termaat
Zach Lorber-Termaat
7,680 Points

I am also stuck on this one. The apostrophe isnt the problem, i have a feeling its the underscore in func move(_ direction: string). I have tried everything i can think of but am still stuck with the code below. Someone please help!

class Robot: Machine { override func move(_direction: String) { switch _direction { case "Up": location.y += 1 case "Down": location.y -= 1 case "Left": location.x -= 1 case "Right": location.x += 1 default: break } } }

Raphael Reiter
Raphael Reiter
6,820 Points

class Robot: Machine { override func move(_ direction: String) { switch direction { case "Up": location.y += 1 case "Down": location.y -= 1 case "Left": location.x += 1 case "Right": location.x -= 1 default: break } }

    }