CODEWITHSUNDEEP
ruby
user7826796
user7826796

Reputation:

Looping through a nested hash

I have:

hash = {key1: "value1", key2: {key3: "value2", key4: "value3"}}

My goal is to access the values of key3 and key4.

My code is:

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

I get an output with error:

key1
NoMethodError: undefined method `each' for "value1":String

Can someone explain what is going on, and why I am getting this error?

Upvotes: 1

Views: 4421

Answers (1)

Md. Farhan Memon
Md. Farhan Memon

Reputation: 6121

{key1: "value1", key2: {key3: "value2", key4: "value3"}}

Your hash is not consistent hash of hashes, in the first iteration, value is value1 which is a string, and you cannot iterate over a string.

to avoid that, you can check beforehand like,

hash.each do |key,value|
  p key
  if value.is_a?(Hash)
    value.each do |k,v|
      p k
      p v
    end
  else
    p value
  end
end

My goal is to access the values of key3 and key4. (I want to put them in a variable of some kind to be used elsewhere)

you can traverse a hash based on key associations. As per your need above, you can simply do:

hash[:key2][:key3]
#=> "value2"
hash[:key2][:key4]
#=> "value3"

Upvotes: 2

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