Creates a reactive timer with the given interval. A
reactive timer is like a reactive value, except reactive
values are triggered when they are set, while reactive
timers are triggered simply by the passage of time.
Usage
reactiveTimer(intervalMs = 1000)
Arguments
intervalMs
How often to fire, in milliseconds
Value
A no-parameter function that can be called from a
reactive context, in order to cause that context to be
invalidated the next time the timer interval elapses.
Calling the returned function also happens to yield the
current time (as in Sys.time).
Details
Reactive functions and observers that
want to be invalidated by the timer need to call the
timer function that reactiveTimer returns, even if
the current time value is not actually needed.