Created
March 5, 2015 04:30
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functional flatten_hash
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| def flatten_hash(hash) | |
| hash.keys + hash.values.select do |value| | |
| value.respond_to?(:keys) | |
| end.map do |hash| | |
| flatten_hash(hash) | |
| end.flatten | |
| end |
flat_map will help out a bit here too
I like the functional approach. My own is pretty much the same.
def flatten_hash(hash)
hash.keys.concat(hash.values.select { |v| v.respond_to?(:keys) }.flat_map(&method(:flatten_hash)))
end
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I prefer
value.respond_to?(:keys)instead ofvalue.is_a?(Hash), because who really cares whether it is a Hash? All we really care about is whether it responds to:keys(and:values).