# Data rectangling {#rectangle-data}

## Introduction

<!--# TO DO: Write introduction. -->

### Prerequisites

In this chapter we'll continue using tidyr, which also provides a bunch of tools to rectangle your datasets.
tidyr is a member of the core tidyverse.

```{r setup, message = FALSE}
library(tidyverse)
```

<!--# TO DO: Write chapter around unnest, hoist, etc. -->