Question

I have loaded in a R console different type of objects.
I can remove them all using

rm(list=ls())

or remove only the functions (but not the variables) using

rm(list=lsf.str())

My question is:
is there a way to remove all variables except the functions

Answer 1

Here’s a one-liner that removes all objects except for functions:

rm(list = setdiff(ls(), lsf.str()))

It uses setdiff to find the subset of objects in the global environment (as returned by ls()) that don’t have mode function (as returned by lsf.str())