Use strings with map and colnames in R

Question

I use this code to list the name of some variables in my R environment.

> IDs <- grep("_temp", ls(), value = T, invert = T)

> str(IDs)

char [1:2] "X" "Y"

Next, I tried to use this IDs to find the colnames with map

IDs %>%
   map(~ colnames(.x))

However, this does not work because both X and Y are inside the "" -> "X" and "Y". Which makes the command be like this:

 colnames("X")

What do I need to do to make the command to run like this:

colnames(X)