::: {.cell hash='03_Data_preprocessing_cache/revealjs/unnamed-chunk-29_6cbaee523c3899256cc203043ba2d76d'}

```{.r .cell-code}
summarise(flights, n_elems = n())
```

::: {.cell-output .cell-output-stdout}
```
# A tibble: 1 × 1
  n_elems
    <int>
1  336776
```
:::
:::