This is a simple Ruby script that helps you memorize a password by making you type it over and over again. It first breaks the password into chunks of 4 characters, helps you to memorize each chunk, then every consecutive pair of chunks, then every consecutive triple... and so on, until you're typing the entire password from memory.

I was able to completely memorize a 131-bit password (20 printable ASCII characters, completely random) in about 20 minutes using this script.

You'll need the 'highline' gem to run this script: gem install highline.

# Ruby Password Trainer require 'highline/import' TIMES_TO_TYPE = 5 CHUNK_SIZE = 4 puts "This is a script that helps you memorize a password." puts "WARNING: Make sure nobody is watching you while you use this script!" print "\nYour password: " password = gets.chop password_chunks = password.split("").each_slice( CHUNK_SIZE ).to_a def gets_noecho ask("") { |q| q.echo = false } end def clear system("clear") end def continue?(round) print "Round #{round} finished. Again? [Y/n] " return gets =~ /^y$/i end def chunks(num_chunks, password_chunks) password_chunks.each_cons( num_chunks ) do |portion| part = portion.join("") # Training left = TIMES_TO_TYPE while left > 0 puts "Type \"#{part}\" #{left} times..." input = gets_noecho if input == part left -= 1 else puts "WRONG! You typed \"#{input}\"" left += 2 end end # Recall test left = TIMES_TO_TYPE wrong = false while left > 0 and not wrong clear puts "Type the same thing #{left} times..." input = gets_noecho if input != part wrong = true else left -= 1 end end print ">> You got #{TIMES_TO_TYPE - left}/#{TIMES_TO_TYPE} right.\n\n" if wrong puts "Try again..." redo end end end round = 0 begin clear 1.upto( password_chunks.length ) do |num_chunks| chunks(num_chunks, password_chunks) end round += 1 end while continue?( round )

My Favorite 'Rubyisms'

I've been using Ruby at work to write watir tests, and I am constantly amazed at how elegant it is. Here are some of my favorite techniques:

Pass a default value block to Hash.new to implement a memoized recursive function:

fibonacci = Hash.new do |h,k|
    h[k ...

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My Favorite 'Rubyisms'

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