bind.md

AsyncResultOption.bind

Namespace: FsToolkit.ErrorHandling

Function Signature:

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

Examples

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

Example 1

Given the following functions:

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

We can get a post's user given a PostId like this:

// Async<Result<Post option, exn>>
getPostById postId
|> AsyncResultOption.bind (fun post -> getUserById post.UserId)