Learn how protocol inheritance is a powerful feature that lets us create more granular designs.
- [Instructor] A protocol can inherit from one…or more protocols and add new requirements…on top of the inherited ones.…A protocol inheritance is a powerful feature…which lets create more granular designs.…Let's open the project by going through the desktop.…Exercise files, chapter two…0 two 0 five…start and opening the protocol…inheritance playground.…So, here is the binary representable protocol.…
Now, lets assume that we want to add new requirements.…Say, we need the ability to save instances…to the local storage and restore them later on.…Also, we need support for Base64 encoding.…We could squeeze in all the functionality in this protocol.…Yet, this means that we assign unrelated responsibilities…like persistence and Base64 encoding to this protocol.…This is a bad sign and it leads to the same issue…we had with monolithics superclasses.…
Instead, we create dedicated protocols…for each requirement set.…First, we create the protocol…that defines the persistence related requirements.…I'm going to call it, Binary Persistable.…
Author
Released
1/2/2018- Comparing object-oriented programming with protocol-oriented programming
- Methods and class-bound protocols
- Adopting a protocol
- Generics
- Declaring asynchronous behavior
- Preparing and implementing fallback logic
- Implementing an app using protocol-oriented programming
Skill Level Intermediate
Duration
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Introduction
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Welcome1m 3s
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1. Protocol-Oriented Programming
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The object-oriented way7m 28s
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POP vs. OO: The differences3m 50s
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2. Protocols
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What's a protocol?2m 29s
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Adopting a protocol1m 8s
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Polymorphism4m 12s
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Protocol inheritance4m 31s
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Protocol extensions4m 59s
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Protocol composition4m 23s
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3. Generics
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Why generics?1m 31s
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Generic types3m 15s
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Generics and protocols2m 48s
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Constrained associated types2m 51s
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4. Implement the Weather App Using POP
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Weather app design2m 54s
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Project overview1m 53s
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Presenting data4m 18s
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Fallback service3m 24s
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Implement fallback logic4m 3s
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Conclusion
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Next steps45s
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Video: Protocol inheritance