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 trialJared Welch
5,616 PointsCode Challenge
I've been stuck of this and I need help!
In the editor you've been provided with two classes - Point to represent a coordinate point and Machine. The machine has a move method that doesn't do anything because most machines are motionless.
Your task is to subclass Machine and create a new class named Robot. In the Robot class, override the move method and provide the following implementation. If you enter the string "Up" the y coordinate of the Robot's location increases by 1. "Down" decreases it by 1. If you enter "Left", the x coordinate of the location property decreases by 1 while "Right" increases it by 1.
Note: If you use a switch statement you can use the break statement in the default clause to exit the current iteration.
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! Im a machine!")
}
}
// Enter your code below
2 Answers
Moritz Lang
25,909 PointsHey Jared, can you please tell us on which part of the challenge you stuck? I could provide you with the solution righth now, but I think that it wouldn't help you in learning how to code by yourself.
Jared Welch
5,616 PointsOverriding the subclass with the move method
ANDREA HEMPHILL
14,484 Points``` 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! Im a machine!")
}
}
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
break
default: "nothing"
}
print(location.y) //this line is to check change
} }
let sample = Robot() // x and y already initialized in Machine class, no need override in Robot class sample.move("Down") // while writing in playground the code is sample.move(direction: "Down")
ANDREA HEMPHILL
14,484 PointsANDREA HEMPHILL
14,484 Pointsclass Point { var x: Int var y: Int
}
class Machine { var location: Point
}
class Robot: Machine {
}
let sample = Robot() // x and y already initialized in Machine class, no need override in Robot class
sample.move("Down") // while writing in playground the code is sample.move(direction: "Down")