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README.md

REPL game

attributes

• read
• evaluate
• print
• loop

Minimal function.

./repl_it_simple.rb is a template you can use to create a REPL in Ruby.

This template adds an infinite looping feature until the word quit is entered.

It includes all the attributes of a REPL.

More function.

./repl_it.rb is a template you can use to create a REPL in Ruby.

This template adds an infinite looping feature until a certain key word is entered.

The template also introduces a new concept: exception handling.

When a user presses control c while your script is running it will exit a bit more gracefully.

Now that you know what methods are, you can write your own methods to further process the input.

Resources

• Wikipedia page

repl_it.rb

#!/usr/bin/env ruby

def exit_words
  ['exit', 'quit', 'q', 'x', 'bye', 'goodbye']
end

def continue? word
  not exit_words.include? word
end

def do_stuff_to(input)
  puts "\nYour response was '#{input}'.\n"
  unless continue? input 
    puts "Good bye."
  end
end

input = ""
catch :ctrl_c do
  begin
    while continue? input
      puts "\nEnter your response.\n#{exit_words} or ^C to exit:\n"
      input = gets.chomp
      do_stuff_to(input)
    end
  rescue Exception
    puts "\nUser interrupted."
  end
end

repl_it_simple.rb

#!/usr/bin/env ruby

def do_stuff_to(input)
  puts "\nYour response was '#{input}'.\n"
end

input = ""
while input != "quit"
  puts "\nEnter your response.\n'quit' or ^C to exit:\n"
  input = gets.chomp
  do_stuff_to(input)
end