如何在散列表上循环？

我有个大麻:

 h
=> {"67676.mpa"=>{:link=>"pool/sdafdsaff", :size=>4556}}


>  h.each do |key, value|
>     puts key
>   puts value
>   end
67676.mpa
linkpool/sdafdsaffsize4556

如何访问循环中值散列中的单独值？

156682 次浏览

小开

You can access the values of a hash directly by calling hash.values. In this case you could do something like

> h = {"67676.mpa"=>{:link=>"pool/sdafdsaff", :size=>4556}}
> h.values.each do |key, value|
>   puts "#{key} #{value}"
> end


link pool/sdafsaff
size 4556

小开

最佳答案

Value is a Hash to so you need iterate on it or you can get only values:-

h.each do |key, value|
puts key
value.each do |k,v|
puts k
puts v
end
end

h.each do |key, value|
puts key
value.values.each do |v|
puts v
end
end

小开

You'll want to recurse through the hash, here's a recursive method:

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:

h = {
"x" => "a",
"y" => {
"y1" => {
"y2" => "final"
},
"yy1" => "hello"
}
}
ihash(h)

小开

The simplest way to separate out all three values in this case would be as follows:

h.each do |key, value|
puts key
puts value[:link]
puts value[:size]
end

小开

I little improved Travis's answer, how about this gist:

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
}