> For the complete documentation index, see [llms.txt](https://www.rxjs.es/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.rxjs.es/operadores/filtering/sampletime.md).

# sampleTime

<details>

<summary>Signatura</summary>

#### Firma

`sampleTime<T>(period: number, scheduler: SchedulerLike = async): MonoTypeOperatorFunction<T>`

#### Parámetros

#### Retorna

`MonoTypeOperatorFunction<T>`: Un Observable que emite la emisión más reciente del Observable fuente en el intervalo de tiempo especificado.

</details>

## Descripción

Toma una muestra del Observable fuente a intervalos periódicos de tiempo, emitiendo la emisión más reciente en dicho periodo de tiempo.

![Diagrama de canicas del operador sampleTime](https://github.com/puntotech/rxjs-docu/blob/master/doc/operators/filtering/assets/images/marble-diagrams/filtering/sampleTime.png)

`sampleTime` emite la emisión más reciente del Observable fuente, desde el último muestreo, a no ser que la fuente no haya emitido nada desde el último muestreo. El muestreo ocurre de forma periódica, cada `period` milisegundos (o la unidad de tiempo definida por el argumento opcional `scheduler`.) El muestreo comienza en cuando se realice la suscripción al Observable resultante.

## Ejemplos

**Emitir el valor más reciente desde el último muestreo, realizado cada 2 segundos**

[StackBlitz](https://stackblitz.com/edit/rxjs-sampletime-1?file=index.ts)

```javascript
import { fromEvent, interval } from "rxjs";
import { sampleTime } from "rxjs/operators";

const number$ = interval(1000);

number$.pipe(sampleTime(2000)).subscribe(console.log);
// Salida: 0, 2, 4, 6, 8...
```

**Emitir la tecla pulsada más reciente desde el último muestreo, realizado cada 2 segundos**

[StackBlitz](https://stackblitz.com/edit/rxjs-sampletime-2?file=index.ts)

```typescript
import { fromEvent } from "rxjs";
import { map, sampleTime } from "rxjs/operators";

const key$ = fromEvent<KeyboardEvent>(document, "keydown");

key$
  .pipe(
    sampleTime(2000),
    map(({ code }) => code)
  )
  .subscribe((code) =>
    console.log(`La tecla pulsada más reciente es: ${code}`)
  );
// Salida: (Pulsar tecla y) (Pulsar tecla x) La tecla pulsada más reciente es: KeyX
```

### Ejemplo de la documentación oficial

**Cada segundo, emitir el click más reciente**

```javascript
import { fromEvent } from "rxjs";
import { sampleTime } from "rxjs/operators";

const clicks = fromEvent(document, "click");
const result = clicks.pipe(sampleTime(1000));
result.subscribe((x) => console.log(x));
```

### Recursos adicionales

[![Source code](https://github.com/puntotech/rxjs-docu/blob/master/doc/operators/filtering/assets/icons/source-code.png)](https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/sampleTime.ts)

* [Documentación oficial en inglés](https://rxjs.dev/api/operators/sampleTime)


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