Link to tidymodels

rectangling.qmd

@@ -363,7 +363,7 @@ You'll learn more about `map_lgl()` in @sec-iteration.
 tidyr has a few other useful rectangling functions that we're not going to cover in this book:
 
 -   `unnest_auto()` automatically picks between `unnest_longer()` and `unnest_wider()` based on the structure of the list-column. It's great for rapid exploration, but ultimately it's a bad idea because it doesn't force you to understand how your data is structured, and makes your code harder to understand.
--   `unnest()` expands both rows and columns. It's useful when you have a list-column that contains a 2d structure like a data frame, which you don't see in this book.
+-   `unnest()` expands both rows and columns. It's useful when you have a list-column that contains a 2d structure like a data frame, which you don't see in this book, but you might encounter if you use the [tidymodels](https://www.tmwr.org/base-r.html#combining-base-r-models-and-the-tidyverse) ecosystem.
 -   `hoist()` allows you to reach into a deeply nested list and extract just the components that you need. It's mostly equivalent to repeated invocations of `unnest_wider()` + `select()` so read up on it if you're trying to extract just a couple of important variables embedded in a bunch of data that you don't care about.
 
 These functions are good to know about as you might encounter them when reading other people's code or tackling rarer rectangling challenges yourself.