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.
You can install the development version of react from GitHub with:
pak::pak("tadascience/react")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)
})