如何转换Ruby哈希以使其所有键都是符号？ [英] How do I convert a Ruby hash so that all of its keys are symbols?

问题描述

  {id=> 123，name=> test} 
  

我想将它转换为：

  {：id => 123，：name => test} 
  

解决方案

  hash = {apple=> 香蕉，椰子=> domino} 
 Hash [hash.map {| k，v | [k.to_sym，v]}] 
＃=> {：apple =>banana，：coconut =>domino} 
  

更新：

@mu太短：没有看到递归一词，但是如果你坚持（同时保护不存在 to_sym ，只是想提醒一下，在Ruby 1.8中 1.to_sym == nil ，所以玩一些关键类型可以误导）：

  hash = {a=> {b=> c}，d=> e，Object.new => g} 
 
 s2s = 
 lambda do | h | 
哈希=== h？ 
 Hash [
 h.map do | k，v | 
 [k.respond_to？（：to_sym）？ k.to_sym：k，s2s [v]] 
 end 
]：h 
 end 
 
 s2s [hash]＃=> {：d =>e，＃<对象：0x100396ee8> =>g，：a => {：b =>c}} 
  

I have a Ruby hash which looks like:

{ "id" => "123", "name" => "test" }

I would like to convert it to:

{ :id => "123", :name => "test" }

解决方案

hash = {"apple" => "banana", "coconut" => "domino"}
Hash[hash.map{ |k, v| [k.to_sym, v] }]
#=> {:apple=>"banana", :coconut=>"domino"}

Update:

@mu is too short: Didn't see word "recursive", but if you insist (along with protection against non-existent to_sym, just want to remind that in Ruby 1.8 1.to_sym == nil, so playing with some key types can be misleading):

hash = {"a" => {"b" => "c"}, "d" => "e", Object.new => "g"}

s2s = 
  lambda do |h| 
    Hash === h ? 
      Hash[
        h.map do |k, v| 
          [k.respond_to?(:to_sym) ? k.to_sym : k, s2s[v]] 
        end 
      ] : h 
  end

s2s[hash] #=> {:d=>"e", #<Object:0x100396ee8>=>"g", :a=>{:b=>"c"}}

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