How to add new column to an dataframe (to the front not end)?

Question

How to add a new variable to an existing data frame, but I want to add to the front not end. eg. my dataframe is

b c d
1 2 3
1 2 3
1 2 3

I

Answer 1

If you want to do it in a tidyverse manner, try add_column from tibble, which allows you to specifiy where to place the new column with .before or .after parameter:

library(tibble)

df <- data.frame(b = c(1, 1, 1), c = c(2, 2, 2), d = c(3, 3, 3))
add_column(df, a = 0, .before = 1)

#   a b c d
# 1 0 1 2 3
# 2 0 1 2 3
# 3 0 1 2 3