Reclassify select columns in Data Table

Question

I wish to change the class of selected variables in a data table, using a vectorized operation. I am new to the data.table syntax, and am trying to learn as much as possible. I

Answer 1

I think that @SimonO101 did most of the Job

data[, names(data)[index] := lapply(.SD, as.character) , .SDcols = index ]

You can just use the := magic