Fastest way to drop rows with missing values?

Question

I\'m working with a large dataset x. I want to drop rows of x that are missing in one or more columns in a set of columns of x, that

Answer 1

This should be faster than using apply:

x[rowSums(is.na(x[, ..varcols])) == 0, ]
#    var1 var2 textcol
# 1:    0    0       e
# 2:    0    1       f
# 3:    1    0       h
# 4:    1    1       i