R add column to 0-row df

In R, how to add a column to a zero-row data.frame?

I can’t do df[,'newcol'] <- NULL or c() because these statements actually drop existing columns.

df <- data.frame(col1=c(1:3), col2=letters[1:3])
df <- df[-c(1:3),]
df[,'newcol'] <- NULL

>Solution :

If you know the column type, you could add an empty column type:

df$newcol <- numeric(0)
df

[1] col1   col2   newcol
<0 rows>