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Dec 16th, 2018
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hashes = [
{:a => 5, :b => 2},
{:a => 5, :c => 3},
{:a => 5, :d => 4},
{:e => 5}
]
result = hashes.inject do |memo, hash|
memo.merge(hash) { |key, old, new| old + new }
end
p result
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