ruby - How should I use each_with_object on Hashes? -


i use each_with_object on hash can't figure out how should use it. here have:

hash = {key1: :value1, key2: :value2} hash.each_with_object([]) { |k, v, array| array << k }  nomethoderror: undefined method `<<' nil:nilclass

is possible use each_with_object on hashes? if yes, syntax?

use ():

hash.each_with_object([]) { |(k, v), array| array << k }

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