tadascience / react

☢️ Reactivity helper for 'shiny' ✨

react

The goal of react is to help with reactivity, instead of calling the foo reactive expression foo() you can call react$foo similar to how one calls input$bar for inputs, or alternatively react[foo] or react[foo()].

The benefit is that it makes it easier to spot calls to reactive expressions in your server code.

Installation

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

pak::pak("tadascience/react")

Examples

Take this from the shiny example:

server <- function(input, output) {

  dataInput <- reactive({
    getSymbols(input$symb, src = "yahoo",
               from = input$dates[1],
               to = input$dates[2],
               auto.assign = FALSE)
  })

  output$plot <- renderPlot({
    chartSeries(dataInput(), theme = chartTheme("white"),
                type = "line", log.scale = input$log, TA = NULL)
  })

}

With react you can rewrite the plot output as one of these, depending on your taste.

  # react$ is similar conceptually to how input$ works
  output$plot <- renderPlot({
    chartSeries(react$dataInput, theme = chartTheme("white"),
                type = "line", log.scale = input$log, TA = NULL)
  })
  
  # react[] 
  output$plot <- renderPlot({
    chartSeries(react[dataInput], theme = chartTheme("white"),
                type = "line", log.scale = input$log, TA = NULL)
  })
  
  # react[()] so that you still have the calling a function feel
  #           and you just sourround it
  output$plot <- renderPlot({
    chartSeries(react[dataInput()], theme = chartTheme("white"),
                type = "line", log.scale = input$log, TA = NULL)
  })
  

react's Issues

🌱 Release react 2024.4.1

Prepare for release:

• git pull
• Check current CRAN check results
• Polish NEWS
• urlchecker::url_check()
• devtools::build_readme()
• devtools::check(remote = TRUE, manual = TRUE)
• devtools::check_win_devel()
• revdepcheck::revdep_check(num_workers = 4)
• Update cran-comments.md
• git push

Submit to CRAN:

• usethis::use_version('patch')
• devtools::submit_cran()
• Approve email

Wait for CRAN...

• Accepted 🎉
• usethis::use_github_release()
• usethis::use_dev_version(push = TRUE)

Release react 2024.1.0

First release:

• usethis::use_cran_comments()
• Update (aspirational) install instructions in README
• Proofread Title: and Description:
• Check that all exported functions have @return and @examples
• Check that Authors@R: includes a copyright holder (role 'cph')
• Check licensing of included files
• Review https://github.com/DavisVaughan/extrachecks

Prepare for release:

• git pull
• urlchecker::url_check()
• devtools::build_readme()
• devtools::check(remote = TRUE, manual = TRUE)
• devtools::check_win_devel()
• git push

Submit to CRAN:

• usethis::use_version('patch')
• devtools::submit_cran()
• Approve email

Wait for CRAN...

• Accepted 🎉
• usethis::use_github_release()
• usethis::use_dev_version(push = TRUE)