arktype•2mo ago

Testing a type in pipe

Congratulations on the 2.0 release, it's working great! 😀 Is it possible/best practice to run a type inside pipe? I'm having this test condition:

If string is a valid url, return URL
Else return null

If string is a valid url, return URL
Else return null

I'm not sure of the best way to handle this scenario with morphs? I see there's a second parameter for pipe.try, can it be used to simplify?

4 Replies

ciscoheatOP•2mo ago

Here's the simple solution:

const nullUrl = type('string').pipe((s) => {
  try {
    return new URL(s);
  } catch {
    return null;
  }
});

const nullUrl = type('string').pipe((s) => {
  try {
    return new URL(s);
  } catch {
    return null;
  }
});

But can it be improved with morphs?

ssalbdivad•2mo ago

No but it could be simplified with pattern matching which we're about to release 😊 I mean under the hood, pattern matching is just an ordered union with morphs... but without the new syntax, creating an ordered union in 2.0.4 would probably be a bit confusing haha (you'd have to use the underlying @ark/schema representation)

ssalbdivad•2mo ago

At that point you will be able to do it like this:

ciscoheatOP•5w ago

Ok, looks very nice!

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Testing a type in pipe

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