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read_with_open.rb

This Ruby code snippet demonstrates how to read a JSON file using the JSON library in Ruby. The code first opens the JSON file using the File.open() method, which takes the path to the file as an argument. The block passed to File.open() is executed for each line in the file, and in this case, it reads the contents of the file into a string variable called j.

The JSON.load() method is then called on the string j, which parses the JSON data contained in the string and returns a Ruby object that represents the data in the file. The returned object can be manipulated using Ruby methods, such as each to iterate over the data or select to filter out specific elements.

For example, if the JSON file contains an array of objects representing people, the code could use the select() method to find all the people who are aged between 20 and 30, like this:

require 'json'
File.open('input/json/file.json') {|j| JSON.load(j).select {|person| person['age'] >= 20 && person['age'] <= 30}}

This code would return an array of objects representing all the people who are between 20 and 30 years old, as specified by the select block.

Ruby code snippet

require 'json'
#=> true
File.open('input/json/file.json') {|j| JSON.load(j)}
#=> {"key" => "value"}

Executed with Ruby 3.4.4.