How do I eliminate elements from my array if all their elements are empty?

Question

I'm using Ruby 2.4. I have an array of arrays, which looks roughly like this

[[2, 3, 4], ["", "", ""], ["a", "b", nil], [nil, "", nil], [151, "", "abcdef"]]

How would I eliminate all the arrays in the above list if all of their elements are either nil or empty? After applying this function to the above, I'd expect teh result to be

[[2, 3, 4], ["a", "b", nil], [151, "", "abcdef"]]

Answer 1

Something like this using reject and all:

arr.reject { |ar| ar.all? { |e| e.to_s.empty? } }      
 #=> [[2, 3, 4], ["a", "b", nil], [151, "", "abcdef"]]

The key here is nil.to_s.empty? #=> true.