> For the complete documentation index, see [llms.txt](https://soufatn.gitbook.io/rxjs-book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://soufatn.gitbook.io/rxjs-book/summary/observable/observable_methods/toasync.md).

# toAsync

Converts the function into an asynchronous function. Each invocation of the resulting asynchronous function causes an invocation of the original synchronous function on the specified scheduler.

## Arguments

1. `func` *(`Function`)*: Function to convert to an asynchronous function.
2. `[scheduler=Rx.Scheduler.timeout]` *(`Scheduler`)*: Scheduler to run the function on. If not specified, defaults to Scheduler.timeout.
3. `[context]` *(`Any`)*: The context for the func parameter to be executed.  If not specified, defaults to undefined.

### Returns

*(`Function`)*: Asynchronous function.

### Example