Turning a Hash of Arrays into an Array of Hashes in Ruby

Question

We have the following datastructures:

{:a => [\"val1\", \"val2\"], :b => [\"valb1\", \"valb2\"], ...}

And I want to turn that into

Answer 1

You could use inject to build an array of hashes.

hash = { :a => ["val1", "val2"], :b => ["valb1", "valb2"] }
array = hash.inject([]) do |pairs, pair|
  pairs << { pair[0] => pair[1] }
  pairs
end
array.inspect # => "[{:a=>["val1", "val2"]}, {:b=>["valb1", "valb2"]}]"

Ruby documentation has a few more examples of working with inject.