Checkpoint 8
Updated for Xcode 15
Now that you understand how protocols and extensions work, it’s time to pause our learning and take on a challenge so you can put it all into practice.
Your challenge is this: make a protocol that describes a building, adding various properties and methods, then create two structs, House and Office, that conform to it. Your protocol should require the following:
- A property storing how many rooms it has.
- A property storing the cost as an integer (e.g. 500,000 for a building costing $500,000.)
- A property storing the name of the estate agent responsible for selling the building.
- A method for printing the sales summary of the building, describing what it is along with its other properties.
I’ll provide some hints in a moment, but first I recommend you go ahead and try it yourself.
Hacking with Swift+ subscribers can get a complete video solution for this checkpoint here: Solution to Checkpoint 8. If you don’t already subscribe, you can start a free trial today.
Still here? Okay, here are some hints:
- Start by designing the protocol fully before you go near any structs.
- Remember you can’t provide implementations for methods in your protocol.
- You get to decide whether your properties should be get-only or have getters and setters. For example, maybe the number of rooms is constant, but perhaps you also want to take into account someone adding an extension.
- You can control the read-write status of a property using
{ get }or{ get set }.
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