The example codes on dplyr package.

dplyr_examples.r

library(dplyr)

iris_df <- as_data_frame(iris)
iris_df %>% rename_(.dots = setNames(names(.), toupper(names(.)))) %>% head(2)
# A tibble: 2 × 5
# SEPAL.LENGTH SEPAL.WIDTH PETAL.LENGTH PETAL.WIDTH SPECIES
# <dbl>       <dbl>        <dbl>       <dbl>  <fctr>
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa

x <- c("A", "B", "C", "A", "B")
recode(x, .dots = setNames(c(1, 2, 3), c("A", "B", "C")))
# [1] 1 2 3 1 2

x <- c(1, 2, 3, 2, 1)
recode(x, .dots = setNames(c("A", "B", "C"), c(1, 2, 3)))
# [1] "A" "B" "C" "B" "A"