A package for making coding challenges, largely inspired by the learnr package.

Install the package off of GitHub via

devtools::install_github("dgkf/riddlr")

Try out some examples:

library(shiny)
app_file <- system.file("example", "shiny", "single_question", "app.R", package = "riddlr")
shinyAppFile(app_file)

library(shiny)
app_file <- system.file("example", "shiny", "question_catalog", "app.R", package = "riddlr")
shinyAppFile(app_file)

A lot of this package is inspired by learnr, with early versions being built directly into learnr's Rmarkdown framework. The scope is slightly different, being an evaluation tool rather than a learning tool. From this slight change in perspective, there were a few features that learnr couldn't accommodate.

• easily testing code against multiple test cases, whereas learnr only handles a single input
• timeout per test case (or timeout with a grace period for feedback)
• hooks for triggering database logs
• easier addition of markdown-formatted help dialogs

Could this all be contributed back to the learnr package? Absolutely, but ensuring code quality, reusability and consistency within the learnr framework wasn't within scope for the proof-of-concept.

A lot of work was put into giving a comfortable programming interface with staple features like improved code completion, help-text popups, parsing errors and warnings noted in the code form gutter. All of these features were first added internally as part of the proof-of-concept, but were later contributed back to the shinyAce package.

A huge thank you goes out to @vnijs and @detule for giving great feedback on such a large body of new features and diligently checking many edge cases that would have gone unaddressed.