Learn what protocols are, and how to declare adoption of and conform to protocol requirements. See examples of conforming to common protocols in the Swift standard library.
- [Instructor] I'm starting out on a playground…that combines simplified versions…of examples I used previously in this chapter.…A protocol is essentially a contract…defining requirements that an adopting type…agrees to implement,…such as properties and methods.…You can define your own protocols,…but what I'm going to focus on here…is how to adopt and conform to existing protocols.…For example, I will make the electric vehicle class…adopt the Custom String Convertible protocol,…which requires implementing a description string property,…so that the instance can be printed out…in a preferred format.…
An easy way to determine what a protocol's requirements are…is by command clicking on it.…So now I'll implement the description property…required by this protocol.…This is a computed property,…meaning that it does not store a value,…but instead calculates and returns a value.…A string, in this case.…Computed properties are defined…by writing curly braces following the declaration,…and the type must be explicitly declared.…
Learn how to write code, understand Swift's key concepts and best practices, and strengthen your programming problem-solving skills. Instructor Scott Gardner teaches the fundamentals, so you'll be prepared to develop applications for iOS, macOS, and other platforms. Completing this course will enable you to not only write first-class code, but to think like a Swift developer.
- Creating playgrounds
- Defining variables and constants
- Working with characters and strings
- Working with collections and groups
- Using operators and defining custom operators
- Controlling program flow
- Defining functions and closures
- Working with classes, structures, and enumerations
- Adopting protocols
Skill Level Beginner
1. Get Started
2. Variables and Constants
3. Characters and Strings
4. Collections and Tuples
6. Control Flow
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