How to merge two arrays of hashes
I would rebuild your data a bit, since there are redundant keys in hashes:
thin_b = b.map { |h| [h[:key], h[:value]] }.to_h#=> {1=>"bar", 1000=>"something"}thin_a = b.map { |h| [h[:key], h[:value]] }.to_h#=> {1=>"bar", 1000=>"something"}Then you can use just Hash#merge:
thin_a.merge(thin_b)#=> {1=>"bar", 2=>"baz", 1000=>"something"}But, if you want, you can get exactly result as mentioned in question:
result.map { |k, v| { key: k, value: v } }#=> [{:key=>1, :value=>"bar"}, # {:key=>2, :value=>"baz"}, # {:key=>1000, :value=>"something"}]