Is this the best way to grab common elements from a Hash of arrays?

Question

I\'m trying to get a common element from a group of arrays in Ruby. Normally, you can use the & operator to compare two arrays, which returns elements

Answer 1

Behold the power of inject! ;)

[[1,2,3],[1,3,5],[1,5,6]].inject(&:&)
=> [1]

As Jordan mentioned, if your version of Ruby lacks support for &-notation, just use

inject{|acc,elem| acc & elem}