map2

Namespace: FsToolkit.ErrorHandling

Function Signature:

('a -> 'b -> 'c) -> Job<'a> -> Job<'b> -> Job<'c>

Examples

Example 1

Given the functions

getFollowerIds : UserId -> Job<UserId list>
createPost : CreatePostRequest -> Job<PostId>

And the type

type NotifyNewPostRequest =
  { UserIds : UserId list
    NewPostId : PostId }
  static member Create userIds newPostId =
    { UserIds = userIds; NewPostId = newPostId }

We can create a NotifyNewPostRequest using Job.map2 as below:

let createPostAndGetNotifyRequest (req : CreatePostRequest) =
  // Job<NotifyNewPostRequest>
  Job.map2
    NotifyNewPostRequest.Create
    (getFollowerIds req.UserId)
    (createPost req)