我如何循环遍历 ruby 中的哈希值
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原文地址: http://stackoverflow.com/questions/9279768/
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how do i loop over a hash of hashes in ruby
提问by Matt Elhotiby
OK so i have this hash
好的，所以我有这个哈希
h
=> {"67676.mpa"=>{:link=>"pool/sdafdsaff", :size=>4556}}
> h.each do |key, value|
> puts key
> puts value
> end
67676.mpa
linkpool/sdafdsaffsize4556
how do i access the separate values in the value hash on the loop
我如何访问循环中值哈希中的单独值
回答by shingara
Value is a Hash to so you need iterate on it or you can get only values:-
值是一个哈希值，因此您需要对其进行迭代，否则您只能获得值：-
h.each do |key, value|
puts key
value.each do |k,v|
puts k
puts v
end
end
or
或者
h.each do |key, value|
puts key
value.values.each do |v|
puts v
end
end
回答by Travis Reeder
You'll want to recurse through the hash, here's a recursive method:
您需要通过哈希递归，这是一个递归方法：
def ihash(h)
h.each_pair do |k,v|
if v.is_a?(Hash)
puts "key: #{k} recursing..."
ihash(v)
else
# MODIFY HERE! Look for what you want to find in the hash here
puts "key: #{k} value: #{v}"
end
end
end
You can Then take any hash and pass it in:
然后，您可以获取任何散列并将其传入：
h = {
"x" => "a",
"y" => {
"y1" => {
"y2" => "final"
},
"yy1" => "hello"
}
}
ihash(h)
回答by Jakub Kuchar
I little improved Travis's answer, how about this gist:
我几乎没有改进 Travis 的回答，这个要点怎么样：
https://gist.github.com/kjakub/be17d9439359d14e6f86
https://gist.github.com/kjakub/be17d9439359d14e6f86
class Hash
def nested_each_pair
self.each_pair do |k,v|
if v.is_a?(Hash)
v.nested_each_pair {|k,v| yield k,v}
else
yield(k,v)
end
end
end
end
{"root"=>{:a=>"tom", :b=>{:c => 1, :x => 2}}}.nested_each_pair{|k,v|
puts k
puts v
}
回答by Jeremy Lynch
The simplest way to separate out all three values in this case would be as follows:
在这种情况下，分离所有三个值的最简单方法如下：
h.each do |key, value|
puts key
puts value[:link]
puts value[:size]
end
回答by roo
You can access the values of a hash directly by calling hash.values. In this case you could do something like
您可以通过调用直接访问哈希值hash.values。在这种情况下，你可以做类似的事情
> h = {"67676.mpa"=>{:link=>"pool/sdafdsaff", :size=>4556}}
> h.values.each do |key, value|
> puts "#{key} #{value}"
> end
link pool/sdafsaff
size 4556
