将 Ruby 哈希值转换为数组
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Converting Ruby hashes to arrays
提问by Aditya Manohar
I have a Hash which is of the form
{:a => {"aa" => 11,"ab" => 12}, :b => {"ba" => 21,"bb" => 22}}
我有一个哈希形式
{:a => {"aa" => 11,"ab" => 12}, :b => {"ba" => 21,"bb" => 22}}
How do i convert it to the form {:a => [["aa",11],["ab",12]],:b=>[["ba",21],["bb",22]]}
我如何将其转换为表格 {:a => [["aa",11],["ab",12]],:b=>[["ba",21],["bb",22]]}
回答by mikej
If you want to modify the original hash you can do:
如果要修改原始哈希，可以执行以下操作：
hash.each_pair { |key, value| hash[key] = value.to_a }
From the documentation for Hash#to_a
来自Hash#to_a的文档
Converts hsh to a nested array of [ key, value ] arrays.
h = { "c" => 300, "a" => 100, "d" => 400, "c" => 300 }
h.to_a #=> [["c", 300], ["a", 100], ["d", 400]]
将 hsh 转换为 [ key, value ] 数组的嵌套数组。
h = { "c" => 300, "a" => 100, "d" => 400, "c" => 300 }
h.to_a #=> [["c", 300], ["a", 100], ["d", 400]]
回答by Arup Rakshit
Here is another way to do this :
这是另一种方法：
hsh = {:a => {"aa" => 11,"ab" => 12}, :b => {"ba" => 21,"bb" => 22}}
hsh.each{|k,v| hsh[k]=*v}
# => {:a=>[["aa", 11], ["ab", 12]], :b=>[["ba", 21], ["bb", 22]]}
回答by umar
hash.collect {|a, b| [a, hash[a].collect {|c,d| [c,d]}] }.collect {|e,f| [e => f]}
