Array of Hashes Totaling

arr_hash_total.rb

array = [{:stat1 => 34, :stat2 => 37}, {:stat1 => 45, :stat2 => 78}]
total = {}

array.each do |element|
  element.each do |key, val|
    total[key] ||= 0
    total[key] += val
  end
end

total
# => { :stat1 => 79, :stat2 => 115 }

the right way.rb

array = [{:stat1 => 34, :stat2 => 37}, {:stat1 => 45, :stat2 => 78}]
total = {}

the_right_way.rb

array = [{:stat1 => 34, :stat2 => 37}, {:stat1 => 45, :stat2 => 78}]

array.reduce({}) do |total, element| 
  pairs.each do |key, val|
    total[key] ||= 0
    total[key] += val
  end
  total
end

array.reduce({}) {|h,pairs| pairs.each {|k,v| h[k] ||= 0; h[k] += v};h}