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m5rk/gist:1ad633281debcebf93cc

Created March 5, 2015 04:30
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functional flatten_hash
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gistfile1.rb
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
@m5rk
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m5rk commented Mar 5, 2015

I prefer value.respond_to?(:keys) instead of value.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).

@jah2488
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jah2488 commented Mar 7, 2015

flat_map will help out a bit here too

@jah2488
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jah2488 commented Mar 7, 2015

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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