observe()
Function
Observers and Outputs use observe()
.
observe()
sets up a block of code that is run every time one of the reactive values or expressions it uses is updated.
y <- reactiveVal(10)
observe({
message("`y` is ", y())
})
#> `y` is 10
y(5)
#> `y` is 5
y(4)
#> `y` is 4