learnr gained the function learnr::tutorial_package_dependencies(), used to enumerate a tutorial’s R package dependencies. Front-ends can use this to ensure a tutorial’s dependencies are satisfied before attempting to run that tutorial. learnr::available_tutorials() gained the column package_dependencies containing the required packages to run the document. (#329)
Include vignette about publishing learnr tutorials on shinyapps.io
learnr’s built-in tutorials now come with a description as part of the YAML header, with the intention of this being used in front-end software that catalogues available learnr tutorials on the system. (#312)
Add session_start and session_stop events. (#311)
Fixed a bug where broken exercise code created non-“length-one character vector”. (#311)
Fixed extra parameter documentation bug for CRAN. (#323)
Fixed video initialization error caused by a jQuery version increase in Shiny. (#326)
Fixed progressive reveal bug where the next section would not be displayed unless refreshed. (#330)
Fixed a bug where topics would not be loaded if they contained non-ascii characters. (#330)
Quiz questions are implemented using shiny modules (instead of htmlwidgets). (#194)
Aggressively rerender prerendered tutorials in favor of a cohesive exercise environment (#169, #179, and rstudio/rmarkdown#1420)
Added a new function, safe, which evaluates code in a new, safe R environment. (#174)
Added the last evaluated exercise submission value, last_value, as an exercise checker function argument. (#228)
Question width will expand to the container width. (#222)
Available tutorial names will be displayed when no name parameter or an incorrect name is provided to run_tutorial(). (#234)
The options parameter was added to question to allow custom questions to pass along custom information. See sortable::sortable_question for an example. (#243)
Missing package dependencies will ask to be installed at tutorial run time. (@isteves, #253)
When questions are tried again, the existing answer will remain, not forcing the user to restart from scratch. (#270)
A version number has been added to question_submission events. This will help when using custom storage methods. (#291)
Tutorial storage on the browser is now executed directly on indexedDB using idb-keyval (dropping localforage). This change prevents browser tabs from blocking each other when trying to access indexedDB data. (#305)
Fixed a spurious console warning when running exercises using Pandoc 2.0. (#154)
Added a fail-safe to try-catch bad student code that would crash the tutorial. ([@adamblake](https://github.com/adamblake), #229)
Replaced references to checkthat and grader in docs with gradethis (#269)
Removed a warning created by pandoc when evaluating exercises where pandoc was wanting a title or pagetitle. #303
Fixed #136 by displaying full HTML messages (rather than just the text) if provided by the incorrect or the correct args to question(). (#146)
Improved documentation for deploying learnr tutorials in Shiny Server. (#142)
Fixed a highlight.js issue from rmarkdown 1.8. (#133)
Fixed an false positive in the diagnostics system. (#141)
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