修改ruby中的内部散列

我有一个哈希：{"word1" => {"doc1" => 1, "doc2" => 1}}

现在，当我插入我通过这个词本身就带有文件ID例如哈希一个新词WORD2和DOC2应该给我：

{"word1" => {"doc1" => 1, "doc2" =>1}, "word2" => {"doc2" => 1}}

如果我现在补充：字1和文档1应该给我：

{"word1" => {"doc1" => 2, "doc2" =>1}, "word2" => {"doc2" => 1}}

注：DOC1的价值增加了1

和WORD2和DOC2

{"word1" => {"doc1" => 2, "doc2" =>1}, "word2" => {"doc2" => 2}}

此外，如果添加一个新的doc3的说单词2它应该给我：

{"word1" => {"doc1" => 2, "doc2" =>1}, "word2" => {"doc2" => 2, "doc3" => 1}}

我该如何做到这一点！

来源

2012-04-02 bytebiscuit

irb(main):005:0> words = Hash.new { |h,k| h[k] = Hash.new(0) } 
irb(main):006:0> words["word1"]["doc1"] += 1 
irb(main):007:0> words["word1"]["doc1"] += 1 
irb(main):008:0> words["word2"]["doc2"] += 1 
irb(main):009:0> words 
=> {"word1"=>{"doc1"=>2}, "word2"=>{"doc2"=>1}}

当然，如果你愿意，你可以将它封装到函数中。

来源

2012-04-02 01:07:09

假设散列最初是空的！ – bytebiscuit 2012-04-02 01:12:11

@bytebiscuit：固定。 – 2012-04-02 01:15:02

“Hash :: new”的块形式非常神奇。我应该先查找API！ – DigitalRoss 2012-04-02 01:23:51

@h = {} 

def addword word, doc 
    inner = @h[word] || {} 
    @h[word] = inner.merge(doc => (inner[doc] || 0) + 1) 
    p [:hash_is_now, @h] 
end 

addword 'word1', 'doc1' 
addword 'word1', 'doc2' 
addword 'word2', 'doc2' 
addword 'word1', 'doc1' 
addword 'word2', 'doc2' 
addword 'word2', 'doc3'

来源

2012-04-02 01:12:25 DigitalRoss

谢谢DR，很高兴认识其他选择！ – bytebiscuit 2012-04-02 01:29:24

修改ruby中的内部散列

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