获取哈希中具有相同值的所有键 [英] Get all keys in hash with same value

问题描述

我试图从散列中获取具有相同值的所有键，并将它们作为单独的条目放入一个数组中.我有这行代码，但它将所有内容作为单个条目发送:

I am trying to get all the keys with the same value from a hash and put them into an array as separate entries. I have this line of code but it sends everything in as a single entry:

@highest_wf_words << h.select {|k, v| v == val}.keys

谁能建议如何分隔键，所以我最终得到 [["a"],["b"],["c"]] 而不是 [["a","b","c"]],

can anyone advise how to separate the keys so I end up with [["a"],["b"],["c"]] instead of [["a","b","c"]],

推荐答案

也许是这个?

h.select {|k, v| v == val}.keys.each {|k| @highest_wf_words << [k]}

或者这个:

@highest_wf_words.concat(h.select {|k, v| v == val}.keys.map {|k| [k]})

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