How can I make a named list or vector from environment objects, using the object names? [duplicate]

Question

I am trying to take objects in my environment, and put them into a list or vector that is named with the names of the object. Here is an illustration:

a = 1
b = 2

desired <- c(a, b)
names(desired) <- c("a", "b")
desired
#> a b 
#> 1 2

My attempts have been variations of the following. I can see why this doesn't work (even if my terminology might not quite be right): it's pausing the evaluation after figuring out that ... is 1, 2. However, I want some way to get it to give a, b so that I can put the names on properly. I am open to any solutions, in base R, rlang or others.

name_list <- function(...){
  names <- enquote(list(...))
  values <- list(...)
  return(names)
}
print(name_list(a, b))
#> quote(list(1, 2))

Created on 2018-07-10 by the reprex package (v0.2.0).

The tibble::lst function does this in a "tidyverse way": tibble::lst(a, b). If you want to see how it does it, just type the name of the function without the parenthesis to see the source code: tibble::lst. — MrFlick
– MrFlick, Commented Jul 11, 2018 at 1:40

chinsoon12 · Accepted Answer · 2018-07-11 00:39:54Z

3

You can use match.call to retrieve the names of the arguments being passed in

name_list <- function(...){
  vnames <- as.character(match.call())[-1]
  return(setNames(list(...), vnames))
}
a = 1; b=c(1,2)
name_list(a, b)

answered Jul 11, 2018 at 0:39

chinsoon12

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1 Comment

Calum You Over a year ago

ah great, that's awesome! will keep that one around for sure

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