find a key in nested hash ruby
def nested_hash_value(obj,key)
if obj.respond_to?(:key?) && obj.key?(key)
obj[key]
elsif obj.respond_to?(:each)
r = nil
obj.find{ |*a| r=nested_hash_value(a.last,key) }
r
end
end
h = { foo:[1,2,[3,4],{a:{bar:42}}] }
p nested_hash_value(h,:bar)
#=> 42dig method in ruby How to check whether a nested hash element exists
class Hash
def dig(*path)
path.inject(self) do |location, key|
location.respond_to?(:keys) ? location[key] : nil
end
end
endCopyright © 2021 Codeinu
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