Ruby sort by multiple values?

Question

I have an array of hashes:

a=[{ \'foo\'=>0,\'bar\'=>1 },
   { \'foo\'=>0,\'bar\'=>2 },
   ... ]

I want to sort the array first

Answer 1

a.sort { |a, b| [a['foo'], a['bar']] <=> [b['foo'], b['bar']] }