bind.md

JobOption.bind

Namespace: FsToolkit.ErrorHandling

Function Signature:

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

Examples

Note: Many use-cases requiring bind can also be solved using the jobOption computation expression.

Example 1

Given the following functions:

tryFindPersonById : int -> Job<Person option>
tryFindAddressById : int -> Job<Address option>

We can look up a person's address like this:

// Job<Address option>
tryFindPersonById 42
|> JobOption.bind (fun person -> tryFindAddressById person.AddressId)

Example 2

tryParseInt : string -> int option
tryFindPersonById : int -> Job<Person option>

// Job<Person option>
job { return tryParseInt "3001" }
|> JobOption.bind tryFindPersonById