> For the complete documentation index, see [llms.txt](https://3440217568.gitbook.io/rxswift/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://3440217568.gitbook.io/rxswift/decision_tree/elementat.md).

# elementAt

## elementAt

**只发出 `Observable` 中的第 n 个元素**

![](/files/-MWlwS1n38oaDLT1C61P)

**elementAt** 操作符将拉取 `Observable` 序列中指定索引数的元素，然后将它作为唯一的元素发出。

## 演示

```swift
let disposeBag = DisposeBag()

Observable.of("🐱", "🐰", "🐶", "🐸", "🐷", "🐵")
    .elementAt(3)
    .subscribe(onNext: { print($0) })
    .disposed(by: disposeBag)
```

**输出结果：**

```swift
🐸
```