apply.md

TaskOption.apply

Namespace: FsToolkit.ErrorHandling

Function Signature:

Task<('a -> 'b) option> -> Task<'a option> -> Task<'b option>

Examples

Take the following function for example

// string -> int
let characterCount (s: string) = s.Length

Example 1

let result =
    TaskOption.some "foo" // Task<string option>
    |> TaskOption.apply (TaskOption.some characterCount) // Task<int option>

// task { Some 3 }

Example 2

let result =
    Task.singleton None // Task<string option>
    |> TaskOption.apply (TaskOption.some characterCount) // Task<int option>

// task { None }

Example 3

let result : Task<int option> =
    TaskOption.some "foo" // Task<string option>
    |> TaskOption.apply (Task.singleton None) // Task<int option>

// task { None }