apply

Namespace: FsToolkit.ErrorHandling
Function Signature:
Result<('a -> 'b) option, 'c> -> Result<'a option, 'c> 
  -> Result<'b option, 'c>
Examples
Take the following function for example
// string -> int
let characterCount (s: string) = s.Length
Example 1
let result =
    Ok(Some "foo") // Result<string option, 'error>
    |> ResultOption.apply (Ok(Some characterCount)) // Result<int option, 'error>
​
// Ok (Some 3)
Example 2
let result =
    Ok None // Result<string option, 'error>
    |> ResultOption.apply (Ok(Some characterCount)) // Result<int option, 'error>
​
// Ok None
Example 3
let result =
    Error "bad things happened" // Result<string option, string>
    |> ResultOption.apply (Ok(Some characterCount)) // Result<int option, string>
​
// Error "bad things happened"

ResultOption

bind

Last modified 2mo ago