productivus

A suite of productivity tools for R -- debugging, visualization, inline editing, etc.

Debug interactively

Imagine you wrote something like

very_long_expression <- lapply(some_long_list, some_long_function)

You can bring up that expression in your favorite text editor and execute it from R by using the ed function, which matches a regular expression backwards through your R history to find the find instance:

ed("sion <-") # Matches "very_long_expression <- " and will bring up the
 # above code to edit in your favorite editor and execute after editing.

Ruby-like block-accepting functions

Ruby has the notion of passing a "block" to a function: just a bunch of code you wish you could be run within the function, but it should be up to the function to decide how. You can now do this in R.

plus_with_yield <- with_block(function(x, y) { x + y + yield() })
stopifnot(plus_with_yield(1, 2, { 3 + 4 }) == 10)