How do you delete a column by name in data.table?

Question

To get rid of a column named \"foo\" in a data.frame, I can do:

df <- df[-grep(\'foo\', colnames(df))]

However, once df

Answer 1

I simply do it in the data frame kind of way:

DT$col = NULL

Works fast and as far as I could see doesn't cause any problems.

UPDATE: not the best method if your DT is very large, as using the $<- operator will lead to object copying. So better use:

DT[, col:=NULL]