How to delete all variables except an environment

Question

I would like to delete all global variables except a defined environment with variables in it.

Say I have the following:

my.env = new.env()
assign("a", 123, envir = my.env)
my.env$somestring = "Variable mat as vector string"

And also some global variables:

Age     <-  as.numeric(42)
HbA     <-  as.numeric(2)
WHR     <-  as.numeric(1.3)

I know I can delete all global variables but one with setdiff

setdiff(ls(),'Age')
#[1] "HbA"    "my.env" "WHR" 

but when I call the following I get an error. This is expected because my.env is actually a pointer, if I am not mistaken

setdiff(ls(), my.env)
#Error in as.vector(x, mode) : 
#  cannot coerce type 'environment' to vector of type 'any'

How can I delete all variables but keep my.env ? (with the variables in it)

Answer 1

Try

to.del <- setdiff(ls(), "my.env")
rm(list = to.del)

# not relevant anymore
eval(parse(text = paste0("rm(", to.del, ")")))