Giving the list returned by purrr::map names

Question

Is there a way to automatically give names to the returned list given by purrr:map?

For example, I run code like this very often.

fn <- function(x) { paste0(x, "_") }
l <- map(LETTERS, fn)
names(l) <- LETTERS

I'd like for the vector that is being automated upon to automatically become the names of the resulting list.

Cutlerr

This is not an answer because it doesn't use purrr::map, but just to note that base::Map does automatically assign names as desired. – Saad

Answer 1

We can use imap

imap(setNames(LETTERS, LETTERS), ~ paste0(.x, "_"))

Or map with a named vector

map(setNames(LETTERS, LETTERS), ~ paste0(.x, "_"))

Nona

Also see purrr::set_names, which will name a vector with itself if no names are given: set_names(LETTERS). – Phanerozoic

Answer 2

This seems like a clean way to do it to me:

purrr::map(LETTERS, paste0, "_") %>% purrr::set_names()

Thanks to the comment left by aosmith for identifying purrr::set_names. Note if you want to set the names to something else, just say ... %>% set_names(my_names).

Stumper