散列到分组阵列 [英] Hash into grouped array

问题描述

我不是在Ruby中非常有经验，因此IM奋力格式化的数据块。

我有这个哈希至极包含某些键具有相同的值，例如：

  {钥匙=＆GT; 值1，键2=＆GT; 值2，KEY3=＆GT; 值3，KEY4=＆GT; 值1，KEY5=＆GT; 值2..}
 

我想变成这样，包含由值进行分组键的数组

  [键，KEY4]，[键2，KEY5]，[KEY3]]
 

任何帮助将是AP preciated。

解决方案

  new_hash = {}
hash.each做|键，值|
  new_hash [值] || = []
  new_hash [值]＆LT;＆LT;键
结束
阵列= new_hash.values​​＃=＆GT; [钥匙，KEY4]，[键2，KEY5]，[KEY3]]
 

im not very experienced in ruby, so im struggling to format a piece of data.

I have this hash, wich contains some keys that have the same value, ex:

{"key" => "value1", "key2" => "value2", "key3" => "value3", "key4" => "value1", "key5" => "value2" ..}

I'm trying to turn this into, an array containing the keys grouped by the values

 [["key","key4"],["key2","key5"],["key3"]]

Any help would be appreciated.

解决方案

new_hash = {}
hash.each do |key, value|
  new_hash[value] ||= []
  new_hash[value] << key
end
array = new_hash.values # => [["key", "key4"], ["key2", "key5"], ["key3"]]

这篇关于散列到分组阵列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！