Parsing from a JSON file in Ruby and Extract numbers from Nested Hashes

Question

Now I am working on extracting information from a JSON file in Ruby. Then how can I extract just the numbers next to the word 'score' from the following text file? For example, I want to get 0.6748984055823062, 0.6280145725181376 on and on.

{   "sentiment_analysis": [     {       "positive": [         {           "sentiment": "Popular",           "topic": "games",           "score": 0.6748984055823062,           "original_text": "Popular games",           "original_length": 13,           "normalized_text": "Popular games",           "normalized_length": 13,           "offset": 0         },         {           "sentiment": "engaging",           "topic": "pop culture-inspired games",           "score": 0.6280145725181376,           "original_text": "engaging pop culture-inspired games",           "original_length": 35,           "normalized_text": "engaging pop culture-inspired games",           "normalized_length": 35,           "offset": 370         },      "negative": [     {       "sentiment": "get sucked into",       "topic": "the idea of planning",       "score": -0.7923352042939829,       "original_text": "Students get sucked into the idea of planning",       "original_length": 45,       "normalized_text": "Students get sucked into the idea of planning",       "normalized_length": 45,       "offset": 342     },     {       "sentiment": "be daunted",       "topic": null,       "score": -0.5734506634410159,       "original_text": "initially be daunted",       "original_length": 20,       "normalized_text": "initially be daunted",       "normalized_length": 20,       "offset": 2104     }, 

What I have tried is that I could read a file and set the text file to a hash variable using the JSON method.

require 'json' json = JSON.parse(json_string) 

Answer 1

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!