如何在我的散列中查找键以映射到符合条件的元素？ [英] How do I find keys in my hash to map to elements that match a condition?

问题描述

我有一个将整数映射到数组的散列。例如

I have a hash that maps integers to arrays. For example

{1 => ["abc"], 2 => ["ccc", "ddd"]}

如何从我的散列中获得所有密钥有数组中至少有两个元素？

How do I get all the keys from my hash that have arrays with at least 2 elements in them?

推荐答案

{1 => ["abc"], 2 => ["ccc", "ddd"]}.select{|_, a| a.length > 1}.keys
# => [2]

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