> 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_instance_methods/takeuntil.md).

# takeUntil

Returns the values from the source observable sequence until the other observable sequence or Promise produces a value.

## Arguments

1. `other` *(`Observable` | `Promise`)*: Observable sequence or Promise that terminates propagation of elements of the source sequence.

## Returns

*(`Observable`)*: An observable sequence containing the elements of the source sequence up to the point the other sequence or Promise interrupted further propagation.

## Example