Zug Simulator

README.md

Zug Simulator

In this exercise, we'll model the behavior of an U-Bahn or S-Bahn train.

Given a route which provides stations (just strings), the train's current station, and whether or not it's traveling in reverse (i.e., from the last stop to the first stop), the train should complete the route in the correct direction.

When the train's complete_route method is called, it should print a summary of the stops to standard output. The first line should announce the route and where it's headed. The following lines should list the stations traveled to. After the last stop, print "Endbahnhof" to signal the end of the route.

Here's a complete example of the expected output for the U8 route from Wittenau to Hermannstraße, starting from Schönleinstraße and traveling in the forward direction.

U8 Richtung Hermannstrasse
Hermannplatz
Boddinstrasse
Leinestrasse
Hermannstrasse
Endbahnhof

route.rb

# Routes are composed of a name (e.g., U8) and an array of stations.
# 
# To use one of the sample routes to test your train class, e.g.:
#
#  train = Train.new(Route::BVG.u8, 'Wittenau')
#
class Route
  attr_reader :name, :stations

  def initialize(name, stations)
    @name, @stations = name, stations
  end

  # Example routes that can be used for testing:
  module BVG
    def self.u8
      Route.new('U8', [
        'Wittenau',
        'Rathaus Reinickendorf',
        'Karl-Bonhoeffer-Nervenklinik',
        'Lindauer Allee',
        'Paracelsus-Bad',
        'Residenzstrasse',
        'Franz-Neumann-Platz',
        'Osloer Strasse',
        'Pankstrasse',
        'Gesundbrunnen',
        'Voltastrasse',
        'Bernauer Strasse',
        'Rosenthaler Platz',
        'Weinmeisterstrasse',
        'Alexanderplatz',
        'Jannowitzbruecke',
        'Heinrich-Heine-Strasse',
        'Moritzplatz',
        'Kottbusser Tor',
        'Schoenleinstrasse',
        'Hermannplatz',
        'Boddinstrasse',
        'Leinestrasse',
        'Hermannstrasse',
      ])
    end

    def self.s75
      Route.new('S75', [
        'Westkreuz',
        'Charlottenburg',
        'Savignyplatz',
        'Zoologischer Garten',
        'Tiergarten',
        'Bellevue',
        'Hauptbahnhof',
        'Friedrichstrasse',
        'Hackescher Markt',
        'Alexanderplatz',
        'Jannowitzbruecke',
        'Ostbahnhof',
        'Warschauer Strasse',
        'Ostkreuz',
        'Noeldnerplatz',
        'Lichtenberg',
        'Friedrichsfelde Ost',
        'Springpfuhl',
        'Gehrenseestrasse',
        'Hohenschoenhausen',
        'Wartenberg',
      ])
    end
  end
end

train.rb

class Train
  def initialize(route, current_station, reverse = false)
    # ...
  end

  def complete_route
    # ...
  end

  # define additional methods here...
end

train_spec.rb

require './lib/train'

describe Train do
  describe '#initialize' do
  end

  describe '#complete_route' do
  end
end