Add Result.fromCb Method

[kadiryazici]

We have Result.from but what if We want to use callback and use it's exception as Error and return value as Ok also it supports Promise, this method provides it.

I was using this method in my projects and it was really helpful while working with Promises or Exceptions, I thought that it would be nice if library includes this method.

Example

const user: Result<User, UserNotFoundError> = Result.fromCb(() => {
  const foundUser = findUser(); // Throws if cannot find 
  return foundUser
})

if(user.isErr()) {
  const userError = user.unwrapErr();
}

user.unwrap();

// Async
const user: Result<User, UserNotFoundError> = await Result.fromCb(async () => {
  const foundUser = await findUser(); // Throws if cannot find 
  return foundUser
})

const foo = Result<Foo, FooError> = await Result.fromCb(() => Promise.resolve(5));
const bar = Result<Bar, BarError> = await Result.fromCb(() => Promise.reject(new Error()));

[traverse1984]

Well, you might kick yourself - but this is built in: Result.safe.

There are a couple of differences between the implementations, so I'd suggest checking out the docs for safe: https://www.npmjs.com/package/oxide.ts#safe

[kadiryazici]

@traverse1984 sorry my bad 😢 I should read carefully thanks.

[traverse1984]

No worries... appreciate your interest and you made a good implementation. Nice work.