Create named lists when using map_* on stringifyable argument

[holgerbrandl]

As discussed in https://stackoverflow.com/a/56949741/590437 it would be great if map_* could produce a named list (either by default or via method parameter), if the argument is coercible to a string.

Example implementation (overwriting map in the current environment)

map = function(x, ...){
    if (is.integer(x) | is.character(x)) { # this should be done in a more clever way
        purrr::map(x, ...) %>% set_names(x)
    }else {
        purrr::map(x, ...) 
    }
}

1 : 5 %>% map(~ .x + 1)

[gabrielodom]

Any traction on this?

[lionel-]

This is by design. Adding the names might be useful for data analysis but would make purrr harder to program with because of failed assumptions. As a package, purrr is at the intersection of data analysis and package programming, which explains this kind of design decisions.

Also the SO issue is missing the recommended solution to this problem:

letters %>% set_names() %>% map(toupper)