map3

Namespace: FsToolkit.ErrorHandling

Function Signature:

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

Examples

Example 1

Given the functions

getFollowerIds : UserId -> Job<UserId list>
createPost : CreatePostRequest -> Job<PostId>
getTimestamp : unit -> Job<DateTimeOffset>

And a combining function:

let makeNotification userIds postId timestamp =
  { UserIds = userIds; PostId = postId; CreatedAt = timestamp }

We can combine three jobs using Job.map3 as below:

// Job<Notification>
Job.map3
  makeNotification
  (getFollowerIds req.UserId)
  (createPost req)
  (getTimestamp ())