How to substitute NA by 0 in 20 columns?

Question

I want to substitute NA by 0 in 20 columns. I found this approach for 2 columns, however I guess it\'s not optimal if the number of columns is 20. Is there any alternative a

Answer 1

Another option:

library(tidyr)
v <- c('b', 'c', 'e', 'f')
replace_na(df, as.list(setNames(rep(0, length(v)), v)))

Which gives:

#  a b c  d e f g d.1
#1 1 0 0  2 3 4 7   6
#2 2 g 3 NA 4 5 4   Y
#3 3 r 4  4 0 t 5   5