Parsing from a JSON file in Ruby and Extract numbers from Nested Hashes
You can use Array#map
to collect the reviews.
reviews = json['sentiment_analysis'][0]
positive_reviews = reviews['positive']
negative_reviews = reviews['negative']
positive_reviews.map { |review| review['score'] }
=> [0.6748984055823062, 0.6280145725181376]
negative_reviews.map { |review| review['score'] }
=> [-0.7923352042939829, -0.5734506634410159]
Hope this helps!
Using the JSON
class:
Importing a file:
require "json"
file = File.open "/path/to/your/file.json"
data = JSON.load file
Optionally, you can close it now:
file.close
The file looks like this:
{
"title": "Facebook",
"url": "https://www.facebook.com",
"posts": [
"lemon-car",
"dead-memes"
]
}
The file is now able to be read like this:
data["title"]
=> "Facebook"
data.keys
=> ["title", "url", "posts"]
data['posts']
=> ["lemon-car", "dead-memes"]
data["url"]
=> "https://www.facebook.com"
Hope this helped!
Parse Data from File:
data_hash = JSON.parse(File.read('file-name-to-be-read.json'))
Then just map over the data!
reviews = data_hash['sentiment_analysis'].first
reviews.map do |sentiment, reviews|
puts "#{sentiment} #{reviews.map { |review| review['score'] }}"
end
I think this is the simplest answer.