Iterating through a array of hashes in Ruby (parsed JSON)

Question

I have this array of hashes that was created when a did a API call and ran it through JSON.parse:

{
  "results": [
    {
      "zip": "08225",
      "city": "Northfield",
      "county": "Atlantic",
      "state": "NJ",
      "distance": "0.0"
    },
    {
      "zip": "08221",
      "city": "Linwood",
      "county": "Atlantic",
      "state": "NJ",
      "distance": "1.8"
    }
  ]
}

I am trying to get all the zipcodes out of each object and put them into an array:

zipcode_array = Array.new

I have tried the following code:

locations.each do |zipcode|
    zipcode_array.push(['results'][i]['zip'])
end

I would like my final output to be:

zipcode_array = ["08225", "08221"]

Anyone have any tips on what I'm missing?

Tip: Instead of the verbose Java style Array.new you can do [ ] in Ruby to make a new, empty array. Array.new is saved for special occasions like Array.new(10,0) when you want an array with a particular pre-defined size and (optional) default. — tadman
– tadman, Commented Apr 15, 2018 at 7:50

Igor Drozdov · Accepted Answer · 2018-04-15 06:16:17Z

7

Your code seems to lack i variable (index) here, but actually you don't need it, since you can always use map function to achieve idiomatic Ruby code:

require "json"

response = '{
  "results": [
    {
      "zip": "08225",
      "city": "Northfield",
      "county": "Atlantic",
      "state": "NJ",
      "distance": "0.0"
    },
    {
      "zip": "08221",
      "city": "Linwood",
      "county": "Atlantic",
      "state": "NJ",
      "distance": "1.8"
    }
  ]
}'

parsed_response = JSON.parse(response)
zipcode_array = parsed_response["results"].map { |address| address["zip"] }

answered Apr 15, 2018 at 6:16

Igor Drozdov

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Comments

Rohit Lingayat · Accepted Answer · 2018-04-15 07:47:23Z

3

instead of using each you can use map function to achieve this.

response[:results].map{|x| x[:zip]}

This will give you the result in array i.e

["08225", "08221"]

edited Apr 15, 2018 at 7:47

answered Apr 15, 2018 at 7:29

Rohit Lingayat

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3 Comments

Rajagopalan Over a year ago

You are iterating the one by one

Rohit Lingayat Over a year ago

yes right. Thanks for pointing out the word iterating. edited my answer for the same. map will give you the new array instead of creating a new one and push into it.

tadman Over a year ago

This is generally the right idea, but JSON hashes will have only string keys, never symbols, at least not without conversion.

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