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read_with_new.rb

This Ruby code snippet demonstrates how to read a CSV file and print its contents to the console. Here’s a breakdown of what each part does:

• require 'csv' loads the CSV library, which is used for reading and writing CSV files.
• File.open("input/csv/file.csv", "r") do |f| opens a file named “file.csv” in the input/csv directory for reading. The “r” flag indicates that the file should be opened for reading only. The block passed to do...end is executed once the file has been successfully opened, and the variable f represents the file object.
• csv = CSV.new(f, headers: true) creates a new instance of the CSV class and initializes it with the file object f. The headers: true option tells the CSV class to expect the first row of the file to contain column headers.
• csv.each do |line| loops through each line in the CSV file, with the variable line representing the current line being processed.
• line.each do |header, val| loops through each header/value pair in the current line, with the variables header and val representing the column header and its corresponding value, respectively.
• p [header, val] prints the current header/value pair to the console using the p function. The square brackets around [header, val] are used to create an array containing the two values, which is then printed to the console.
• puts prints a newline character to the console, effectively ending the line of output for each header/value pair.

Overall, this code reads in a CSV file and prints its contents to the console, with each row being processed in turn and each column being printed separately using the p function.

Ruby code snippet

require 'csv'
#=> true

File.open("input/csv/file.csv", "r") do |f|
  csv = CSV.new(f, headers: true)
  csv.each do |line|
      line.each do |header, val|
          p [header, val]
      end
      puts
  end
end
["key", "key1"]
["value", "value1"]

["key", "key2"]
["value", "value2"]

["key", "key3"]
["value", "value3"]

#=> nil

Executed with Ruby 3.4.4.