如何使用校正因子创建哈希差异？
我想比较一个数组中的哈希：
h_array = [ {:name => "John", :age => 23, :eye_color => "blue"}, {:name => "John", :age => 22, :eye_color => "green"}, {:name => "John", :age => 22, :eye_color => "black"} ] get_diff(h_array, correct_factor = 2) # should return [{:eye_color => "blue"}, {:eye_color => "green"}, {:eye_color => "black"}] get_diff(h_array, correct_factor = 3) # should return # [[{:age => 23}, {:age => 22}, {:age => 22}], # [{:eye_color => "blue"}, {:eye_color => "green"}, {:eye_color => "black"}]] 我想h_array包含的哈希值。 它看起来像一个递归调用/方法，因为h_array可以有多个哈希值但具有相同数量的键和值。 如何实现get_diff方法？
def get_diff h_array, correct_factor h_array.first.keys.reject{|k| h_array.map{|h| h[k]}.sort.chunk{|e| e}.map{|_,e| e.size}.max >= correct_factor }.map{|k| h_array.map{|hash| hash.select{|key,_| k == key}} } end
class Array def find_ndups # also returns the number of items uniq.map { |v| diff = (self.size - (self-[v]).size); (diff > 1) ? [v, diff] : nil}.compact end end h_array = [ {:name => "John", :age => 22, :eye_color => "blue", :hair => "black"}, {:name => "John", :age => 33, :eye_color => "orange", :hair => "green"}, {:name => "John", :age => 22, :eye_color => "black", :hair => "yello"} ] def get_diff(h_array, correct_factor) temp = h_array.inject([]){|result, element| result << element.to_a} master_array = [] unmatched_arr = [] matched_arr = [] temp = temp.transpose temp.each_with_index do |arr, index| ee = arr.find_ndups if ee.length == 0 unmatched_arr << temp[index].inject([]){|result, arr| result << {arr.first => arr.last} } elsif ee.length > 0 && ee[0][1] != correct_factor && ee[0][1] < correct_factor return_arr << temp[index].inject([]){|result, arr| result << {arr.first => arr.last} } elsif ee[0][1] = correct_factor matched_arr << temp[index].inject([]){|result, arr| result << {arr.first => arr.last} } end end return [matched_arr, unmatched_arr] end puts get_diff(h_array, 2).inspect
希望能帮助到你
发现了这个ActiveSupport :: CoreExtensions :: Hash :: Diff模块 。 ActiveSupport 2.3.2和2.3.4有一个内置的Hash :: Diff模块，它返回一个表示两个哈希值之间差异的哈希值。