How to Apply the everything & last_col Functions of tidyselect in R (2 Examples)

In this R post you’ll learn how to select all or the last variable using the everything and last_col functions of the tidyselect package.

Preparing the Examples

data(iris)                     # Example data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa
install.packages("tidyselect") # Install & load tidyselect
library("tidyselect")
install.packages("dplyr")      # Install & load dplyr
library("dplyr")

Example 1: Using everything() Function to Reorder Data Frame

iris %>%                       # everything() function
  everything()
# [1] 1 2 3 4 5
iris %>%                       # select() & everything() functions
  select(Petal.Length, everything()) %>% 
  head()
#   Petal.Length Sepal.Length Sepal.Width Petal.Width Species
# 1          1.4          5.1         3.5         0.2  setosa
# 2          1.4          4.9         3.0         0.2  setosa
# 3          1.3          4.7         3.2         0.2  setosa
# 4          1.5          4.6         3.1         0.2  setosa
# 5          1.4          5.0         3.6         0.2  setosa
# 6          1.7          5.4         3.9         0.4  setosa

Example 2: Using last_col() Function to Select Last Column

iris %>%                       # select() & last_col() functions
  select(last_col()) %>% 
  head()
#   Species
# 1  setosa
# 2  setosa
# 3  setosa
# 4  setosa
# 5  setosa
# 6  setosa

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