Binary Translator

Instructions

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Background

Unfortunately, computers are dumb. They can't understand the complexity of sentences or even words. They can only understand a 0 or a 1. A sequence of 1's and 0's is called binary, and looks something like this:

0010100010101110101101010110101101111101010

Even though Ruby code looks like words, eventually it gets translated into binary so the computer can understand it. Your job is to write a program that will translate a string of text into binary.

Iteration 1

binary_translator.rb includes a map from a lowercase letter to binary that you will use to translate words. Use TDD to drive out the following behavior:

require './lib/binary_translator'
=> true
bt = BinaryTranslator.new
=> #<BinaryTranslator:0x00007f85993a5720 @alpha_to_binary = {...}>
bt.translate("a")
=> "000001"
bt.translate("z")
=> "011010"
bt.translate("turing")
=> "010100010101010010001001001110000111"

Iteration 2

Add support for capital letters. A capital letter should have the same translation as a lowercase letter. Use TDD to drive out the following behavior:

require './lib/binary_translator'
=> true
bt = BinaryTranslator.new
=> #<BinaryTranslator:0x00007f85993a5720 @alpha_to_binary = {...}>
bt.translate("a")
=> "000001"
bt.translate("A")
=> "000001"
bt.translate("turing")
=> "010100010101010010001001001110000111"
bt.translate("TURING")
=> "010100010101010010001001001110000111"

Iteration 3

Add support for characters that are not letters. Spaces should be translated to all 0's. All other non letter characters should be ignored. Use TDD to drive out the following behavior:

require './lib/binary_translator'
=> true
bt = BinaryTranslator.new
=> #<BinaryTranslator:0x00007f85993a5720 @alpha_to_binary = {...}>
bt.translate(" ")
=> "000000"
bt.translate("!@{$#%^&*()}")
=> ""
bt.translate("Hello World!")
=> "001000000101001100001100001111000000010111001111010010001100000100"

Iteration 4

Add support for translating from binary to text. Use TDD to drive out the following behavior:

require './lib/binary_translator'
=> true
bt = BinaryTranslator.new
=> #<BinaryTranslator:0x00007f85993a5720 @alpha_to_binary = {...}>
bt.translate_to_text("001000000101001100001100001111000000010111001111010010001100000100")
=> "hello world"