How do I choose between enums with associated values and structs?

When designing a Swift application, you often need to choose between using enums with associated values and structs. Both approaches have their unique benefits and can be suited for different scenarios.

Enums with Associated Values

Enums with associated values are ideal for representing a finite set of related values that can have different types of data associated with each case. This structure is useful for modeling state machines or when you need to handle multiple cases with varying data.

Structs

Structs, on the other hand, are better suited for modeling complex data types with more properties or behaviors. They are more flexible for organizing data, especially when you need multiple instances that share a common structure.

When to Choose Which?

Use enums with associated values when:

  • You have a limited set of related values.
  • You need to model state transitions or variations.

Use structs when:

  • You need to encapsulate various properties.
  • You require multiple instances with potentially different data.

Example

enum NetworkResponse { case success(data: Data) case failure(error: Error) } struct User { var name: String var age: Int }

Swift Enums Associated Values Structs Design Patterns

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