Introducing learnr

This is a companion discussion topic for the original entry at

We’re pleased to introduce the learnr package, now available on CRAN. The learnr package makes it easy to turn any R Markdown document into an interactive tutorial. Tutorials consist of content along with interactive components for checking and reinforcing understanding. Tutorials can include any or all of the following:
Narrative, figures, illustrations, and equations.
Code exercises (R code chunks that users can edit and execute directly).