如何合并Ruby哈希 [英] How to merge Ruby hashes
本文介绍了如何合并Ruby哈希的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何合并这两个哈希:
How can I merge these two hashes:
{:car => {:color => "red"}}
{:car => {:speed => "100mph"}}
得到:
To get:
{:car => {:color => "red", :speed => "100mph"}}
推荐答案
= http://www.ruby-doc.org/core-1.9.3/Hash.html#method-i-merge> 散列#合并
一>方法:
There is a Hash#merge
method:
ruby-1.9.2 > a = {:car => {:color => "red"}}
=> {:car=>{:color=>"red"}}
ruby-1.9.2 > b = {:car => {:speed => "100mph"}}
=> {:car=>{:speed=>"100mph"}}
ruby-1.9.2 > a.merge(b) {|key, a_val, b_val| a_val.merge b_val }
=> {:car=>{:color=>"red", :speed=>"100mph"}}
如果您需要合并嵌套散列,您可以创建一个递归方法:
You can create a recursive method if you need to merge nested hashes:
def merge_recursively(a, b)
a.merge(b) {|key, a_item, b_item| merge_recursively(a_item, b_item) }
end
ruby-1.9.2 > merge_recursively(a,b)
=> {:car=>{:color=>"red", :speed=>"100mph"}}
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