map

AsyncResultOption.map

Namespace: FsToolkit.ErrorHandling

Function Signature:

('a -> 'b) -> Async<Result<'a option, 'c>> 
  -> Async<Result<'b option, 'c>>

Examples

Note: Many use-cases requiring map operations can also be solved using the asyncResultOption computation expression.

Example 1

Given the function

getUserById : UserId -> Async<Result<User option, exn>>

Then using the AsyncResultOption.map we can get the name of the user like this:

// Async<Result<PersonName option>, exn>
getUserById sampleUserId
|> AsyncResultOption.map (fun user -> user.Name)