> 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/find.md).

# find

Searches for an element that matches the conditions defined by the specified predicate, and returns the first occurrence within the entire Observable sequence.

## Arguments

1. `predicate` *(`Function`)*: A function to test each source element for a condition;  The callback is called with the following information:
   1. the value of the element
   2. the index of the element
   3. the Observable object being subscribed
2. `[thisArg]` *(`Any`)*: Object to use as `this` when executing the predicate.

## Returns

*(`Observable`)*: An Observable sequence with the first element that matches the conditions defined by the specified predicate, if found; otherwise, undefined.

## Example

```javascript
/* Not found */
var array = [1,2,3,4];

var source = Rx.Observable.from(array)
  .find(function (x, i, obs) { return x === 5; });

var subscription = source.subscribe(
  function (x) {
    console.log('Next: %s', x);
  },
  function (err) {
    console.log('Error: %s', err);
  },
  function () {
    console.log('Completed');
  });

// => Completed
```