Reading all scripts and data files from multiple folders

Question

I have two folders, folder1 and folder2 with around 200 files each that are either *rda or *R. I want to read all of the

Answer 1

for (f in list.files(pattern="*.R")) {
    source(f)
}
for (f in list.files(pattern="*.rda")) {
    load(f)
}