shiny
htmltools
req()
seq()
on.exit()
observe()
isolate
observeEvent
eventReactive
reactiveTimer()
invalidateLater(ms)
git
After applying the function to the original list will return a new object.
f(x) |> unlist()
## a b ## 2 1
Rather than modifying the original list.
x |> unlist()
## a b ## 1 1