Ruby gzip compression testing of text

compression_test.rb

require 'zlib'

CHARACTERS = ['a'..'z', 'A'..'Z', 0..9].map(&:to_a).flatten.freeze
TRIES = 10_000
BYTE_RANGE = 50..1000

savings = TRIES.times.each_with_object([]) do |_, arr|
  string = (0...rand(BYTE_RANGE)).map { CHARACTERS[rand(CHARACTERS.size)] }.join
  gzipped = Zlib.gzip(string)
  arr << (1 - gzipped.size.to_f / string.size) * 100
end

puts "Average savings for #{TRIES} tries with strings ranging from " \
     "#{BYTE_RANGE.first} to #{BYTE_RANGE.last} bytes in length:" \
     "\n\n#{savings.sum / savings.size}%"