可能访问哈希每个循环中的索引？

我可能错过了一些明显的东西，但是有没有一种方法可以访问每个循环中散列内部迭代的索引/计数？

hash = {'three' => 'one', 'four' => 'two', 'one' => 'three'} hash.each { |key, value| # any way to know which iteration this is # (without having to create a count variable)? } 

Answer 1

如果你想知道每个迭代的索引，你可以使用.each_with_index

 hash.each_with_index { |(key,value),index| ... } 

Answer 2

您可以迭代键，手动获取值：

 hash.keys.each_with_index do |key, index| value = hash[key] print "key: #{key}, value: #{value}, index: #{index}\n" # use key, value and index as desired end 

编辑：每斜坡的评论，我也刚刚了解到，如果你迭代hash你可以得到的键和值作为元组：

 hash.each_with_index do |(key, value), index| print "key: #{key}, value: #{value}, index: #{index}\n" # use key, value and index as desired end