Question 1

How to validate a non-empty string in Swift using Validated?

Accepted Answer

Define a NonEmptyStringValidator that checks if the string is not empty, then create a typealias like NonEmptyString = Validated<String, NonEmptyStringValidator>. This ensures the string is validated at compile-time or initialization.

Question 2

Validated vs Swift's property observers: which is better for validation?

Accepted Answer

Validated moves validation to compile-time, catching errors earlier and reducing runtime checks, while property observers like didSet provide runtime flexibility. Choose Validated for invariants that must never be violated, and property observers for user input or dynamic changes.

Question 3

Can I use Validated with Swift's Codable for JSON parsing?

Accepted Answer

Yes, but it requires extra work since Validated types have failable initializers. You'll need custom encoding/decoding logic to handle validation during parsing, which can complicate JSON integration.

Question 4

How to combine multiple validators in Validated?

Accepted Answer

Use the built-in And, Or, and Not validators. For example, to create a string that is non-empty and all caps, define a type with And<NonEmptyStringValidator, AllCapsLatinStringValidator> as shown in the README.

Question 5

Is Validated good for validating user input in iOS apps?

Accepted Answer

Not ideal, as user input often requires runtime validation with detailed error messages for feedback. Validated is better for internal invariants and compile-time guarantees, not interactive forms.

Question 6

What are the performance costs of using Validated?

Accepted Answer

Minimal runtime overhead since validation happens at compile-time or during initialization. However, increased type definitions can lead to longer compilation times and more complex code maintenance.

Validated

What is Validated?

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