interactive-tutorials/learnr_notes.Rmd at master · mason-cds-intro-comput-sci/interactive-tutorials · GitHub

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---
title: "learnr and gradethis notes"
output: html_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

## Documentation and Tutorials

* `learnr` documentation: https://rstudio.github.io/learnr/index.html
* `gradethis` documentation: https://rstudio-education.github.io/gradethis/index.html
* Shiny:
  * Official (RStudio) tutorial videos: https://shiny.rstudio.com/tutorial/
  * RStudio articles (more advanced): https://shiny.rstudio.com/articles/
  * *Mastering Shiny* book by Hadley: https://mastering-shiny.org/
* Daniel Chen talk at satRday DC 2020
  * Slides: https://speakerdeck.com/chendaniely/satrday-grading-code-with-gradethis
  * Video: https://www.youtube.com/watch?v=doYOgkq9JG8
* *R packages* book by Hadley: https://r-pkgs.org/

## Setup

Run before installing `learnr` for the first time

```r
devtools::install_github("rstudio/packrat")
```


## Grading `ggplot` objects

See this issue: https://github.com/rstudio-education/gradethis/issues/97

1 Compare `str` output:

  ```r
  pass_if( ~ diffobj::diffStr(.result, a)@diff.count.full == 0, "ok")
  ```

  Has issues with datasets if some columns are stored as lists...

2. Compare svg output

3. Look at properties of ggplot object:

  * https://stackoverflow.com/questions/31038709/how-to-write-a-test-for-a-ggplot-plot
  * https://stackoverflow.com/questions/13457562/how-to-determine-the-geom-type-of-each-layer-of-a-ggplot2-object

4. compare or vdiffr packages: https://stackoverflow.com/questions/51709272/r-test-that-a-ggplot-didnt-change


## Line highlighting

Flair package: https://kbodwin.github.io/flair/

Also see discussion here: https://community.rstudio.com/t/line-highlighting-within-code-chunks-knitted-notebook/58748/5


## Getting session information

* Forum discussion: https://community.rstudio.com/t/how-to-get-user-id-in-the-website-created-by-learnr-and-published-in-rstudio-connect/44067/3
  * and related example on GH here: https://github.com/colearendt/learnr-session-info/blob/master/learnr-session-info.Rmd

## GMU deployment

Deployment server (Summer 2020): http://rs2.mesa.gmu.edu:3939/

* ssh in: `ssh dwhite34@rs2.mesa.gmu.edu`

Example app URL:

* http://rs2.mesa.gmu.edu:3939/intro-to-R/


## Advanced

* Understanding `tidy_eval`: apparently well explained https://ggplot2.tidyverse.org/articles/ggplot2-in-packages.html and https://dplyr.tidyverse.org/articles/programming.html