Question

我有一系列哈希：

[{"green" => 1, "red" => 2, "blue" => 3}, {"green" => 4, "red" => 5, "blue" => 6}]

我想选择红色，蓝色或绿色等于某个数字的哈希值。我该怎么做呢？

Answer 1

如果我理解你的话。

arr = [{"green" => 1, "red" => 2, "blue" => 3}, {"green" => 4, "red" => 5, "blue" => 6}]
some_number = 1
arr.select { |el| el.any? {|k,v| v == some_number} }

改进版本：

arr.select { |el| a.has_value?(some_number) }

版本，如果有更多的密钥不需要测试（例如黄色）：

arr = [{"green" => 1, "red" => 2, "blue" => 3, "yellow" => 5}, {"green" => 4, "red" => 5, "blue" => 6, "yellow" => 3}]
some_number = 1
fields_to_check = ["red", "green", "blue" ]
arr.select { |el| fields_to_check.any? {|color| el[color] == some_number } }

Answer 2

我使用Hash#values_at来获取与您感兴趣的键相关联的值数组：

arr = [{"green" => 1, "red" => 2, "blue" => 3}, {"green" => 4, "red" => 5, "blue" => 6}]
arr.select { |h| h.values_at("red", "green", "blue").include? 1 }

Answer 3

如果您想要在任何键的值等于n

时选择哈希值

 arr.select{|h| h.values.include? n}

选择其中一个指定键的值是否等于n

 arr.select{|h| h.select{|k,v| ("red","green","blue").include? k && v == n}

Ruby选择具有多个条件

3 个答案: