如何拆分散列中等于相同值的键（ruby）

Question

>["nation", "nation", "nation"] => 3

["americans", "oath", "oath", "generation", "americans", "crisis", "crisis", "generation"] => 2,

所以现在我得到的所有这些键都等于相同的值（见上文），我想将它们拆分，以便每个单词=一个值，如下所示。

"nation" => 3
"oath" => 2
"crisis" => 2

Answer 1

听起来你正在寻找

Enumerable#tally

方法：

[
  "americans", "oath", "oath", "generation", "americans", "crisis", "crisis", "generation"
].tally
#=> { "americans" => 2, "oath" => 2, "generation" => 2, "crisis" =>2 }