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Start your free trialDiogo Henriques
iOS Development Techdegree Student 8,035 PointsYour task is to subclass Machine and create a new class named Robot. In the Robot class, override the move method and pr
I don't know where is the mistake, i had look at the preview and i can't find to!
Can anyone tell me where is the mistake please?
Cheers !
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 "Right":
location.x += 1
case "Left":
location.x -= 1
default:
break
}
}
}
1 Answer
Dhanish Gajjar
20,185 PointsHappens a lot to everyone. As you must have noticed there is a _ before the argument "direction". It is meant for omitting the external name. It is necessary, since the code editor is very specific about the challenges. So while your code is correct, it is must to have to Machine class, so the Robot also inherits it.
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
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
}
}
}