SecretHandshake.rb

 # # Binary Secret Handshake
 
# > There are 10 types of people in the world: Those who understand binary, and those who don't.
 
# You and your fellow flatirons are of those in the "know" when it comes to binary decide to come up with a secret "handshake".
 
# ```
# 1 = wink
# 10 = double blink
# 100 = close your eyes
# 1000 = jump
 
# 10000 = Reverse the order of the operations in the secret handshake.
# ```
 
# Write a program that will convert a binary number, represented as a string (i.e. "101010"), and convert it to the appropriate sequence of events for a secret handshake.
 
 
# ```
# handshake = SecretHandshake.new "1001"
# handshake.commands # => ["wink","jump"]
 
# handshake = SecretHandshake.new "11001"
# handshake.commands # => ["jump","wink"]
# ```

# The program should consider strings specifying an invalid binary as the value 0.


 class SecretHandshake
  attr_accessor :binary

  def initialize(binary)
    @binary = binary
  end

  def commands
    command_list = ["wink", "double blink", "close your eyes", "jump"]
    handshake = []
    binary_array = @binary.split("")
    binary_array.reverse.each_with_index do |digit, index|
      if index == 4
        break
      end
      if digit == "1"
        handshake << command_list[index]
      end
    end
    if @binary.to_i >= 10000
      return handshake.reverse
    else
      return handshake
    end
  end

end

 RSpec.configure do |config|
  # Use color in STDOUT
  config.color_enabled = true
 
  # Use color not only in STDOUT but also in pagers and files
  config.tty = true
 
  # Use the specified formatter
  config.formatter = :progress # :progress, :html, :textmate
end
 
describe 'SecretHandshake' do 
  it 'should know how to wink with a 1' do
    handshake = SecretHandshake.new("1")
    handshake.commands.should eq(["wink"])
  end    
 
  it 'should know how to double blink with a 10' do
    handshake = SecretHandshake.new("10")
    handshake.commands.should eq(["double blink"])
  end
 
  it 'should know how to close your eyes with 100' do
    handshake = SecretHandshake.new("100")
    handshake.commands.should eq(["close your eyes"])
  end
 
  it 'should know to jump with 1000' do
    handshake = SecretHandshake.new("1000")
    handshake.commands.should eq(["jump"])
  end
 
  it 'should know to wink double blink with 11' do
    handshake = SecretHandshake.new("11")
    handshake.commands.should eq(["wink","double blink"]) 
  end
 
  it 'should know to double blink, wink, with 10011' do
    handshake = SecretHandshake.new("10011")
    handshake.commands.should eq(["double blink","wink"])
  end
 
  it 'should get this complicated handshake correctly' do
    handshake = SecretHandshake.new("11111")
    handshake.commands.should eq(["jump","close your eyes","double blink","wink"])
  end
 
  it 'should not respond to an invalid code' do
    handshake = SecretHandshake.new("binary")
    handshake.commands.should eq([])
  end
end