Proposal to add Validated.ensureA[EE >: E, B](A => Validated[EE, B]): Validated[EE, A]
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- Dominant language
- Scala
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Description
I sometimes find that I want to run a post-construction verification using validated. The tools that are currently there are:
Validated.andThenwhich requires you to provide a new success even though I want to keep the value I already posess.Validated.ensurein which you can't report more than one failure in one go.
So I wanted to propose a method:
Validated#ensureA[EE >: E, B](check: A => Validated[EE, B]): Validated[EE, A]
that will let run an arbitrary number of post verification steps keeping the original value A in one go.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at the Validated API and read the existing andThen and ensure methods, which the proposal identifies as related behavior. Confirm how a post-construction check can retain the original value while combining validation results; done means the proposed ensureA signature and behavior are covered by tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- scala
- Domain
- backend-api-design
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100