在Ruby中从两个数组中创建一个具有相同值的散列 [英] Creating a hash from two arrays with identical values in Ruby

问题描述

当两个数组中的值相同时，我在创建2个数组的散列时遇到了问题。
eg

  names = [test1，test2] 
 numbers = [1 ，2] 
 Hash [names.zip（numbers）] 
  

给我正是我需要的 => {test1=>1，test2=>2}

然而，如果 是相同的，那么它不能正常工作

  names = [test1，test1] 
数字= [1，2] 
 Hash [names.zip（numbers）] 
  

<但是我预计结果是 {test1=>1 ，test1=>2}

任何帮助表示赞赏

解决方案

哈希不能有重复的键。永远。

如果他们被允许，你将如何访问2？如果你写 myhash [test1] ，你期望得到哪个值？相反，如果你期望

  names = [test1，test1，test2）在一个键下有几个值， ] 
 numbers = [1，2，3] 
 
 Hash.new.tap {| h | names.zip（数字）.each {| k，v | （h [k] || = []）<< v}} 
＃=> {test1=> [1，2]，test2=> [3]} 
  

I'm having issues creating a hash from 2 arrays when values are identical in one of the arrays. e.g.

names = ["test1", "test2"]
numbers = ["1", "2"]
Hash[names.zip(numbers)]

works perfectly it gives me exactly what I need => {"test1"=>"1", "test2"=>"2"}

However if the values in "names" are identical then it doesn't work correctly

names = ["test1", "test1"]
numbers = ["1", "2"]
Hash[names.zip(numbers)] 

shows {"test1"=>"2"} however I expect the result to be {"test1"=>"1", "test1"=>"2"}

Any help is appreciated

解决方案

Hashes can't have duplicate keys. Ever.

If they were permitted, how would you access "2"? If you write myhash["test1"], which value would you expect?

Rather, if you expect to have several values under one key, make a hash of arrays.

names = ["test1", "test1", "test2"]
numbers = ["1", "2", "3"]

Hash.new.tap { |h| names.zip(numbers).each { |k, v| (h[k] ||= []) << v } }
# => {"test1"=>["1", "2"], "test2"=>["3"]}

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