#Title: MBTA Homework, JavaScript!

Objectives:

• Practice with array operations, intersections, etc., and working with arrays and properties of an object literal.

Activity:

• Create a program that models a simple subway system.
• The program takes the line and stop that a user is getting on at and the line and stop that user is getting off at and prints the total number of stops for the trip.
• There are 3 subway lines:
  • The Red line has the following stops: south station, park st, kendall, central, harvard, porter, davis, alewife
  • The Green line has the following stops: haymarket, government center, park st, bolyston, arlington, copley
  • The Orange line has the following stops: north station, haymarket, park st, state, downtown crossing, chinatown, back bay, forest hills
  • All 3 subway lines intersect at park st, but there are no other intersection points. Some of this MBTA is fictionalized. Haymarket does not connect the orange/green lines.

Hints:

• Assume good user input. Don't do lots of checking to ensure good input
• Write all methods as functionally as possible. Separate your input, output and calculation. Attempt to not overwrite variables when possible. Write many methods.
• You should be able to try to calculate the distance in your code without user input, but in the end we'll want user input.
• You need to prompt the user for four pieces of input data.
• Don't capture the user in a while loop. Let the program exit after one calculation.
• Consider diagraming the lines by sketching out the subway lines and their stops and intersection.
• Make subway lines are properties in an object literal, while the values are an array of all the stops on each line.
• The key to the lab is to find the intersection of the lines at park st.
• Make sure the stops that are the same for different lines have different names (i.e. Orange/Haymarket and Green/Haymarket need to be differentiated)