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iOS Swift 2.0 Protocols Creating Flexible Objects Using Protocols Protocol Inheritance

Girish Krishnan
Girish Krishnan
5,237 Points

What am i missing here?

The task simply asks to create a struct named Dog, but the error shows it also needs a property 'numberOfLegs' of type String, which was never mentioned before. Is there something wrong with the task itself or is it my code? thx.

protocols.swift
protocol AnimalType {
  var numberOfLegs: Int { get }
}

protocol PetType: AnimalType {
  var cuddlyName: String { get }
}

struct Dog: PetType {

}

1 Answer

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

It's odd that the error is saying you need String for numberOfLegs as it should be an int. The PetType is going to require a string with a "cuddlyName" (whatever that is). And because it inherits from AnimalType it's going to need a returned Int for the number of legs. See my code for clarification:

protocol AnimalType {
  var numberOfLegs: Int { get }
}

protocol PetType: AnimalType {
  var cuddlyName: String { get }
}

struct Dog: PetType {
  var numberOfLegs: Int{ return 4 }
  var cuddlyName: String{ return "Snookums" }
}
Girish Krishnan
Girish Krishnan
5,237 Points

Thanks Jennifer!

And the error asked for type Int, not String. That was a typo, sorry.