Ruby:获取哈希中的所有键(包括子键) [英] Ruby: Get all keys in a hash (including sub keys)

问题描述

让我们有这个哈希值:

hash = {"a" => 1, "b" => {"c" => 3}}
hash.get_all_keys 
=> ["a", "b", "c"]

由于hash.keys仅返回["a", "b"]

推荐答案

这将为您提供所有嵌套级别的所有键的数组.

This will give you an array of all the keys for any level of nesting.

def get_em(h)
  h.each_with_object([]) do |(k,v),keys|      
    keys << k
    keys.concat(get_em(v)) if v.is_a? Hash
  end
end

hash = {"a" => 1, "b" => {"c" => {"d" => 3}}}
get_em(hash) #  => ["a", "b", "c", "d"]

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