Hi,
I'm working on a presentation regarding the modification of the
function body on-the-fly and just discovered something I don't
understand. I would like to modify a body of the function within a
function, but I see that it is possible only when explicitly referring
to the environment where the function is defined:
fun1 <- function() {
1
body(fun1)[[2]] <- "one"
}
fun1()
body(fun1)
#> {
#> 1
#> body(fun1)[[2]] <- "one"
#> }
fun2 <- function() {
2
env <- environment(fun2)
body(env$fun2)[[2]] <- "two"
}
fun2()
body(fun2)
#> {
#> "two"
#> env <- environment(fun2)
#> body(env$fun2)[[2]] <- "two"
#> }
Can I get some explanation or some links / articles about this,
please? I thought it won't be a difference and I should be able to
modify a function body also in the first case, because I'm changing
something in the parent environment being in the child environment.
Best regards,
Grzegorz
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