Dear Jan & Duncan, Thanks for your replies!
On Wed, 23 Jan 2019 09:56:25 -0500 Duncan Murdoch <[email protected]> wrote: > Defaults of variables are evaluated in the evaluation frame of the > call. So the inside() function is created in the evaluation frame, > and it's environment will be that frame. > When it is called it will create a new evaluation frame (empty in > your example), with a parent being its environment, i.e. the > evaluation frame from when it was created, so it will be able to see > your secret variable. Nice explanation about closures in R inheriting not only their explicitly captured variables, but whole environments of evaluation (not stack) frames where they have been created. > in my opinion it would be fine to write it as > > outside <- function(inside = defaultInsideFn) { > defaultInsideFn <- function() print(secret) > secret <- 'secret' > inside() > } I like this idea; I'm going to use it. -- Best regards, Ivan ______________________________________________ [email protected] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
