Use hooks to format table in output

Question

Using knitr and R Markdown, I can produce a tabularised output from a matrix using the following command:

```{r results=\'asis\'}
kable(head(x))
```
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Answer 1

Nowadays one can set df_print in the YAML header:

---
output:
  html_document:
    df_print: kable  
---

```{r}
head(iris)
```