password_generator.rb

# frozen_string_literal: true

require 'securerandom'

LETTERS     = ('a'..'z').to_a.freeze
BIG_LETTERS = ('A'..'Z').to_a.freeze
DIGITS      = ('0'..'9').to_a.freeze
SPECIAL     = '~`!@#$%^&*()_+{}][;:\'"/?>.<,'.split.freeze
ALL         = (LETTERS + BIG_LETTERS + DIGITS + SPECIAL).freeze

length = SecureRandom.rand(43) + 8 # 8..50

at_least_one = [LETTERS.sample, BIG_LETTERS.sample, DIGITS.sample, SPECIAL.sample]
rest = (length - at_least_one.length).times.map { ALL.sample }

password = (at_least_one + rest).shuffle.join

puts password