RUBY将哈希值附加到数组作为值-不作为参考

问题描述

请参阅此IRB代码：

2.6.6 :107 > h = {}
 => {} 
2.6.6 :108 > a = []
 => [] 
2.6.6 :109 > h["name"] = "hans"
 => "hans" 
2.6.6 :110 > a << h
 => [{"name"=>"hans"}] 
2.6.6 :111 > h["name"] = "paul"
 => "paul" 
2.6.6 :112 > a
 => [{"name"=>"paul"}] 
2.6.6 :113 > 

但这不是我想要的，当我覆盖h Hash时，我不想覆盖已经添加到数组中的值！ ！ ！

解决方法

也许您想要这样：

2.6.6 :107 > h = {}
=> {} 
2.6.6 :108 > a = []
=> [] 
2.6.6 :109 > h["name"] = "hans"
=> "hans" 
2.6.6 :110 > a << h.clone
=> [{"name"=>"hans"}] 
2.6.6 :111 > h["name"] = "paul"
2.6.6 :112 > a
=> [{"name"=>"hans"}]