Drop empty columns from a data.table

An empty column is one whose only values are NA or "".

Usage

drop_empties(d)

Arguments

d

data.table.

Value

d modified by reference, invisibly.

Examples

library('data.table')
d = data.table(w = 3:4, x = c('', 'foo'), y = c(NA, NA), z = c(NA, ''))
drop_empties(d)
#>        w      x
#>    <int> <char>
#> 1:     3       
#> 2:     4    foo