如何在一行中遍历此哈希? [英] How to traverse this hash within one line?

问题描述

哈希中的每个键都有一个也是哈希的值.

Each key in a hash has a value that's also a hash.

    {
      100 => {
        1 => 'ruby',
        2 => 'enumerables'
      },
      50 => {
        3 => 'can',
        4 => 'cause'
      },
      15 => {
        5 => 'occassional',
        6 => 'insanity'
      }
    }

对于每个哈希对象，我想舍弃顶级键，然后将其替换为嵌套哈希对象的键和值.

For each hash object, I want to discard the top-level key, and replace it with the key and value of the nested hash objects.

{
  1 => 'ruby',
  2 => 'enumerables',
  3 => 'can',
  4 => 'cause',
  5 => 'occasional',
  6 => 'insanity'
}

我可以使用它，但是我的方法使用merge!，并且需要创建另一个散列来存储值.我很好奇，看看是否可以在一行中完成.我尝试使用reduce()，但无法使其正常工作.

I have it working, but my method uses a merge!, and requires creating another hash to store the values. I'm curious to see if it can be done in one line. I tried to use reduce(), but could not make it work.

推荐答案

这有效:

hash.values.inject(&:merge)

另一种选择，使用reduce(与inject相同)，并注意tokland的注释，即在使用符号时会自动调用to_proc:

Another option, using reduce (which is the same as inject), and noting tokland's comment that to_proc is automatically called when you use a symbol:

hash.values.reduce(:merge)

然后它不仅变得简洁，而且可读性强.

Then it becomes not only concise but very readable.

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