A demonstration of the walrus operator

demo_walrus

library(tidyverse)
library(rlang)
library(glue)

# string to append to variable name 
suffix <- "A"

# example data frame
dat <- tibble(x = 1:5) %>%
  # create new variable with walrus operator 
  mutate(
    "x_{suffix}" := x
  )

# view data
dat 

# select newly named column
dat %>% 
  dplyr::select(glue::glue("x_{suffix}"))