R-CMD-check Lifecycle: experimental Codecov test coverage CRAN status


usedthese is a pair of functions to summarise R package & function usage in Quarto documents consistent with knitr’s syntax highlighting:

  1. used_here() adds a nicely-rendered summary table of usage to a single document;

  2. used_there() harvests and consolidates the tables created above ready for site-wide analysis.

Example Use Case

Each “little project” on the Quarto website focuses on a data science technique or machine learning model to analyse real-world data. At the foot of each of these is a quantified view of the R packages and functions used in the associated code. This is achieved by including used_here() in each Quarto document.

used_there() scrapes all the tables created by used_here() to enable a Favourite Things article on how R packages and functions are used across the website.

I personally find this approach makes it easier for me to check for consistency of usage, acknowledge the packages I most need to keep abreast of (or go deeper on), and spot opportunities for updates to the latest and greatest.

When the Tidyverse blog announced changes to dplyr and purrr a quick review of my Favourite Things identified a number of opportunities to try out the exciting new features. For example, dplyr introduced temporary grouping with the .by argument for mutate and amigos. group_by() and ungroup() had been used many times and most of these occurrences could be replaced with the new more concise approach.


You can install the development version of usedthese from GitHub with:

# install.packages("devtools")