Morse Translator

Setup

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Activity

Morse Code translates a character into a sequence of dots and dashes. For example, morse code translates the letter "a" to ".-". Your job is to write a program that can translate English words to Morse Code.

For this Activity, you will be adding to the provided MorseTranslator class. You can make any changes to the class you like. For your convenience, the MorseTranslator class includes a Hash with the translations of English characters, numbers, and spaces to Morse Code.

You should be using Test Driven Development when completing the following iterations.

You should be committing code every 20 minutes.

Iteration 1

Use TDD to add a method to the MorseTranslator class called translate that takes a String as an argument and returns a String of the translation to morse code. For this iteration, the translate method only needs to handle lower case letters and spaces.

A MorseTranslator should respond to the following interaction pattern:

  pry(main)> require './lib/morse_translator'
  #=> true

  pry(main)> morse_translator = MorseTranslator.new
  #=> #<MorseTranslator:0x007fa1ab98cac0>

  pry(main)> morse_translator.translate("hello world")
  #=> "......-...-..--- .-----.-..-..-.."

Iteration 2

Use TDD to update the MorseTranslator class's translate method to be able to translate upper case letters and numbers. An upper case letter should have the same translation as a lower case letter.

A MorseTranslator should respond to the following interaction pattern:

  pry(main)> require './lib/morse_translator'
  #=> true

  pry(main)> morse_translator = MorseTranslator.new
  #=> #<MorseTranslator:0x007fa1ab98cac0>

  pry(main)> morse_translator.translate("hello world")
  #=> "......-...-..--- .-----.-..-..-.."

  pry(main)> morse_translator.translate("Hello World")
  #=> "......-...-..--- .-----.-..-..-.."

  pry(main)> morse_translator.translate("There are 3 ships")
  #=> "-......-.. .-.-.. ...-- ..........--...."

Iteration 3

Use TDD to create a Message class with the following criteria:

A Message takes two arguments upon initialization
- The first argument is the message text represented as a String containing upper and lower case letters, numbers, and spaces
- The second argument is a MorseTranslator object
A Message has getter methods called text and translator for reading the arguments
A Message has a method called translation that takes no arguments and returns the text translated to Morse Code

A Message should respond to the following interaction pattern:

pry(main)> require './lib/message'
#=> true

pry(main)> require './lib/morse_translator'
#=> true

pry(main)> morse_translator = MorseTranslator.new
#=> #<MorseTranslator:0x00007f928008a3f8...>

pry(main)> message = Message.new("There are 3 ships", morse_translator)
#=> #<Message:0x00007f927f3f57a0...>

pry(main)> message.translation
#=> "-......-.. .-.-.. ...-- ..........--...."

Iteration 4

Update your MorseTranslator class so that it responds to the following interaction pattern:

  pry(main)> morse_translator = MorseTranslator.new
  #=> #<MorseTranslator:0x007fa1ab98cac0...>

  pry(main)> morse_translator.morse_to_eng(".... . .-.. .-.. ---  .-- --- .-. .-.. -..")
  #=> "hello world"