read_with_read_bom.rb(csv)

This Ruby code snippet reads data from a CSV file named ‘file.csv’. Let’s break it down step by step:

  1. require 'csv': This line imports the CSV library, which provides functionality for reading and writing CSV files in Ruby.

  2. CSV.read('file.csv', encoding: "BOM|UTF-8", headers: true): This line reads the CSV file named ‘file.csv’. The encoding: "BOM|UTF-8" argument specifies the encoding of the file, ensuring proper handling of UTF-8 characters with a Byte Order Mark (BOM) if present. The headers: true argument indicates that the first row of the CSV file contains headers.

  3. .map(&:to_h): This part of the code uses map to iterate over each row of the CSV data and convert it to a hash. &:to_h is shorthand for passing the to_h method as a block to map, which converts each row to a hash where the keys are the header names and the values are the corresponding row values.

So, overall, this code reads data from a CSV file, interprets the first row as headers, and returns an array of hashes where each hash represents a row of data with the headers as keys.

Execution:

require 'csv'
#=> true
CSV.read('file.csv', encoding: "BOM|UTF-8", headers: true).map(&:to_h)
#=> 
[{"key" => "key1", "value" => "value1"},
 {"key" => "key2", "value" => "value2"},
 {"key" => "key3", "value" => "value3"}]

Executed with Ruby 3.4.2