map2

JobResultOption.map2

Namespace: FsToolkit.ErrorHandling

Function Signature:

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

Examples

Note: Many use-cases requiring map2 can also be solved using the jobResultOption computation expression.

Example 1

Given the following functions:

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

And the type:

type UserTweet = { User: User; Post: Post }
let userTweet user post = { User = user; Post = post }

We can combine the results using JobResultOption.map2 as below:

// Job<Result<UserTweet option, exn>>
JobResultOption.map2
  userTweet
  (getUserById sampleUserId)
  (getPostById samplePostId)