R - Evaluate a nested function in an environment

Question

I am trying to run a chunk of R code in a sandbox-ed fashion, by loading all the necessary dependencies (functions and data) into a new environment and evaluating an express

Answer 1

There are a number of ways of doing this, but I kind of like this one:

jobenv <- new.env(parent=globalenv())

local({
    f1 <- function(x) x*2
    f2 <- function(y) f1(y) + 1
}, envir=jobenv)

## Check that it works
ls(jobenv)
# [1] "f1" "f2"
local(f2(3), envir=jobenv)
# [1] 7
eval(quote(f2(3)), envir=jobenv)
# [1] 7