sequenceOptionM

Namespace: FsToolkit.ErrorHandling

Applies the monadic function id to each element in the input list, and returns the result as an option. If any element in the list is None, the entire result will be None.

Function Signature

'a option list -> 'a list option

Examples

Example 1

let myList =
    [
        Some 123
        Some 456
        Some 789
    ]

List.sequenceOptionM myList
// Some [123; 456; 789]

Example 2

let myList =
    [
        Some 123
        None
        Some 789
    ]

List.sequenceOptionM myList
// None