Generics in Swift allow you to develop your code beyond highly specified type and let you create more flexible code that you can reuse in many…
Generics in Swift allow you to develop your code beyond highly specified type and let you create more flexible code that you can reuse in many different ways. When you define a generic function, structure, or class, you use placeholders called type parameters, which represent the types that will be used when the generic code is used. These type parameters are indicated with angle brackets (<>) after the function's name, structure, or class. This course will build on your knowledge of functions, structures, and classes in Swift, and will explain how you can write clear and comprehensive code that avoids duplication by using generics.
In this course on Swift: Generics, you will learn about using generics in arrays and using generics with optional values. We will also discuss how to use generics with structs and functions. By the end of this course, you will understand how to write code that functions with multiple types and identifies requirements for those types.
Learning Objectives
- Describe generics in Swift
- Explain how to use a generic with arrays and optionals in Swift
- Identify generic functions in Swift
Skills you’ll gain
Functional ProgrammingGeneric FunctionGeneric ProgrammingSwift (Programming Language)What You'll Learn
- Describe what generics are in Swift and how type parameters use angle brackets
- Apply generics with arrays and dictionaries to write reusable code
- Use generics with optional values in Swift
- Implement generics with data structures and structs
- Write generic functions that work with multiple types
- Define generic type constraints to identify requirements for types
Key Takeaways
- Generics let you move beyond highly specified types to create more flexible, reusable code that avoids duplication.
- Type parameters are placeholders, indicated with angle brackets after a function, structure, or class name, that represent the types used when the generic code runs.
- The course builds on existing knowledge of functions, structures, and classes in Swift.
- Generics can be used with arrays, optionals, structs, and functions in Swift.
- By the end, you can write code that functions with multiple types and identifies the requirements for those types.
Frequently Asked Questions
What will I learn in this course?
You will learn about using generics in arrays and with optional values, and how to use generics with structs and functions. By the end you will understand how to write code that functions with multiple types and identifies requirements for those types.
Are there any prerequisites for this course?
The course builds on your knowledge of functions, structures, and classes in Swift, so familiarity with those concepts is assumed.
What are type parameters in Swift generics?
Type parameters are placeholders that represent the types used when the generic code is run. They are indicated with angle brackets (<>) after the function's name, structure, or class.
What topics do the lessons cover?
Lessons cover what generics are, generics with arrays and dictionaries, generics and optionals, using generics with data structures, using generics with functions, and generic type constraints.
What skills does this course build?
It builds skills in functional programming, generic functions, generic programming, and the Swift programming language.
Transcript
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Hi, my name is Mark Nair, and in these lessons, you'll learn about generics in Swift. We'll go over their definition, and then we'll see how generics work with arrays, optionals, data structures, functions, and their type constraints. Generics help us break out of the very highly specified type that we are constrained to in Swift. Remember, Swift is a very type-safe language. But we can break out of that a little bit, and that will help us make more flexible code that we can reuse in many different areas. So let's take a look at an example. First, we'll start with a simple function that takes a string and prints a string. There we go. Hello, Jerry. But what if we wanted to greet the character called 7 of 9 from Star Trek? Well, let's try it. I'll just greet to 7. And we get an error because it's an int, but we are expecting right up here a string. Of course, we could cheat and type in something like this. But that doesn't do exactly what we want, or even better yet do this. Still the same problem. So we'll make our type generic, so we can take whatever type we need, and we do it this way. And what this means is that we've added a little placeholder here with the t. This could be anything. It could be number, well, element, for example, but t is a very common placeholder. And I put these in little carrots, and this is representing the generic type that we don't know what it is. Now I can type anything I want in here, for example, true, and this will work just fine, or the number is an int and not a string, and that works just fine too. So that's the gist of a generic, which is it removes how we are tied to a specific type, and we have a lot of flexibility in the code. Thanks for watching. Stay tuned for the next lesson, where I'll show you how generics work with arrays.
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