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Recursive hash merge in Ruby
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def merge_recursively(a, b) | |
result = Hash.new | |
a.each do |key, a_item| | |
if b.key?(key) | |
b_item = b[key] | |
if b_item.is_a? Hash and a_item.is_a? Hash | |
result[key] = merge_recursively(a_item, b_item) | |
else | |
result[key] = b_item.nil? ? a_item : b_item | |
end | |
else | |
result[key] = a_item | |
end | |
end | |
b.each do |key, b_item| | |
unless a.key?(key) | |
result[key] = b_item | |
end | |
end | |
result | |
end |
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