Sorting a two-dimensional array by second value

Question

Ok, say I have an array like so [[z,1], [d,3], [e,2]], how can I sort this array by the second element of each constituent array? So that my array would look like the following?

Answer 1

As user maerics answer it provides Ascending sorting.This answer is very useful for me thanks. For Descending sorting i use -

arr = [[:z,1], [:d,3], [:e,2]]
arr.sort {|a,b| a[1] <=> b[1]}.reverse
#=> [[:d, 3], [:e, 2], [:z, 1]]