What is the CaseIterable Protocol in Swift?

Iterate over an enum’s cases

Photo by Jessica Ruscello on Unsplash

In this quick tutorial, we will learn about the CaseIterable protocol in Swift. This handy protocol allows us to iterate over an enum’s cases.

Let’s Start

Consider the following simple enum:

By conforming it to the CaseIterable protocol, we can get access to the allCases property, which allows us to iterate over each case:

Say we want to construct a String that shows all available application statuses.

We can use .map and .joined functions for that:

The message is printed as expected:

Wrapping Up

Want to learn about other handy Swift protocols? Check out these stories below:

• What is the ExpressibleByIntegerLiteral Protocol in Swift?
• When to Use the Comparable Protocol in Swift
• What is the CustomStringConvertible Protocol in Swift?
• What is the Equatable Protocol in Swift?

Thanks for reading!