Add Variant, match and tap

[JohannesKlauss]

Thank you for the updated library, are you interested in adding the Variant Implementation to enable matching, like proposed in this PR vultix#61 ? That would be a tremendous improvement

[jstasiak]

Hey, that's a good question. Do we have details about this new API, what's the motivation behind it, what problems does it solve etc.? Difficult to say without knowing that.

[JohannesKlauss]

It would allow you to get rid of if else branching in your code, making it a more readable control flow like the matching pattern in scala, kotlin, rust, etc.

So instead of something like this:

const result = createSomeResult()

if(result.ok) {
  // Do something with result
}

// result is an error

You can do something like this:

match(createSomeResult(), {
  Ok: val => // Happy path,
  Err: val => // Error Path,
})

You can also do that with Some and None. This would provide a simple way to use pattern matching on those implementations

[jstasiak]

Thanks for the response. There's already a bunch of methods on Result and Option to (help) achieve exactly that, are these insufficient? If so, do you have an example or two?

[JohannesKlauss]

Yes you're right. map And mapErr are providing basically the same functionality.