> For the complete documentation index, see [llms.txt](https://demystifyfp.gitbook.io/fstoolkit-errorhandling/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://demystifyfp.gitbook.io/fstoolkit-errorhandling/fstoolkit.errorhandling/asyncresult/map3.md).

# map3

### AsyncResult.map3

Namespace: `FsToolkit.ErrorHandling`

Function Signature:

```fsharp
('a -> 'b -> 'c -> 'd)
  -> Async<Result<'a, 'e>>
  -> Async<Result<'b, 'e>>
  -> Async<Result<'c, 'e>>
  -> Async<Result<'d, 'e>>
```

### Examples

Note: Many use-cases requiring `map` operations can also be solved using [the `asyncResult` computation expression](/fstoolkit-errorhandling/fstoolkit.errorhandling/asyncresult/ce.md).