Generic functions are not constrained to predefined types. In this video,explore how to implement a generic function and how it can be used with a variety of types.
- [Instructor] Implementing a new function…for every type leads to a lot of redundant code.…To avoid code duplication we can combine…all the different functions into…a single generic function.…Let's see how.…I open up our project in the exercise files,…chapter three, 0302, start.…To create a generic function,…we need to provide at least one placeholder type.…The placeholder must appear right…after the function name between angle brackets.…
Note that we could've used any other identifier.…Capital T is just a popular way…to defer to generic placeholders.…From now on we can refer to this placeholder type…in the argument list or anywhere in the function's body.…So, let's add the argument list.…It has a left hand side argument…and I'm going to use a placeholder type…and same for the right hand side argument.…The function returns as usual,…a Bool value.…
Let's implement it.…I'm going to return the result…of comparing the two arguments.…As you can see,…we get an error.…Binary operator equals…can not be applied to two T operants.…
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: Generic functions and methods