总和哈希值 Ruby

问题描述

我有一个哈希数组

players =  [{:id=>1, :name=>"Alda", :dice_count=>5, :hand=>[6, 5, 2, 4, 3]},
 {:id=>2, :name=>"Gonzalo", :dice_count=>5, :hand=>[1, 5, 1, 1]},
 {:id=>3, :name=>"Markus", :dice_count=>5, :hand=>[6, 2, 5, 1]},
 {:id=>4, :name=>"Luella", :dice_count=>5, :hand=>[4, 5, 1, 6, 5]}]

我想对数组中每个 :hand 值的大小求和.有没有简单的方法可以做到这一点?

and I would like to sum the size of each :hand value in the array. Is there a simple way to do this?

所以输出将是每个 :hand.size 的总和.在上述情况下，输出将是 18

So the output would be the sum of each :hand.size. In the above case the output would be 18

推荐答案

players.map { |player| player[:hand].size }.reduce(:+) # => 18

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