Lesson 16 - Extensions and their use in Swift
In the previous lesson, Enums and custom errors in Swift, we learned how to use enumerated types and define custom error states in Swift.
Swift offers us the possibility to add functionality to existing data types,
split a class implementation into multiple files or code blocks, and much more.
That's what a powerful concept called extensions does. In
today's tutorial, we'll show you how to add new methods to existing classes or
structs (such as an ordinary Int), separate a protocol
implementation and other tricks.
Extending existing types
This usage of extension is useful when we can’t edit some
existing code. It can be either a part of the language like Int,
String, etc. or, for example, a downloaded library. Perhaps the
most useful feature is to add new methods to classes that aren't even ours and
we have no access to them or don't want to interfere with them.
Example
For example, consider we
...End of the preview...
Continue further
You've come here and that's great! We believe that the first lessons showed you something new and useful
Do you want to continue the course? Go to the premium section.
Buy this course
This article is licensed: Premium II, by buying this article, you agree with the terms of use.
- Unlimited and permanent access to individual lessons.
- High quality IT knowledge.
- Skills to help you get your dream and well-paid job.
Article description
Requested article covers this content:
We'll explain what are extensions in Swift and show how to use them to extend our code and make it more readable.
You gain credits by supporting our network. This is done by sending a helpful amount of money to support the site, or by creating content for the network.
