Protocols can also work with placeholder types. In this video, learn about associated types.
- [Instructor] So far, we've looked at the benefits of…genetic types and functions and how to use them.…How about protocols?…Lets take a look at the Binary Representable protocol.…It defines requirements for any type that can hold…binary data and uses a deck to identify it.…Wouldn't it be great to create a protocol…that is not not restricted to the data pack?…Swift lets us do that.…I'll create a new playground page for this project.…Let's call it "Associated Type".…
I'm going to clean up…because we only need to import the foundation framework.…Next, I'm going to create a new protocol…called "Any Representable".…Protocol, any representable.…I declare an associated type called "Content Type".…The associated type keyword let's us define…placeholder types.…A place holder type is unknown until…a conforming type provides it.…
Then, I add a tag which is of type "String".…Get bar and set bar.…Then, we'll add a content property.…However, for this property…I'm going to use the place holder type…and let's make it read-only.…
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: Generics and protocols