either.md

AsyncOption.either

Namespace: FsToolkit.ErrorHandling

Function Signature

Provide two functions to execute depending on the value of the option. If the option is Some, the first function will be executed. If the option is None, the second function will be executed.

(onSome : 'T -> Async<'output>) -> (onNone : Async<'output>) -> (input : Async<'T option>) -> Async<'output>

Examples

Example 1

AsyncOption.either (fun x -> async { x * 2 }) (async { 0 }) (AsyncOption.some 5)

// async { 10 }

Example 2

AsyncOption.either (fun x -> x * 2) (async { 0 }) None

// async { 0 }