ejparnell / mbta-javascript- Goto Github PK

1. Fork and clone this repository.
2. Change into the new directory.
3. Install dependencies with npm install.
4. Create and checkout a new branch, named response.
5. Follow the directions given in this file.
6. When finished, push to your fork and submit a pull request.

• Finish the function in lib/mbta.js to calculate the number of stops between stations on the "MBTA". Write additional functions used by this function as needed.
• The function takes the line and stop that a rider is getting on at and the line and stop that a rider is getting off at and returns the total number of stops for the trip.

There are 3 subway lines:

• The Red line has the following stops: South Station, Park Street, Kendall, Central, Harvard, Porter, Davis, Alewife
• The Green line has the following stops: Government Center, Park Street, Boylston, Arlington, Copley, Hynes, Kenmore
• The Orange line has the following stops: North Station, Haymarket, Park Street, State, Downtown Crossing, Chinatown, Back Bay, Forest Hills
• All 3 subway lines intersect at Park Street, but there are no other intersection points. Some of this MBTA is fictionalized.

The function will be invoked using the following pattern of arguments:

Start Line, Start Station, End Line, End Station

Here are some examples of how it might be invoked.

stopsBetweenStations('Red', 'Alewife', 'Red', 'Alewife') // 0
stopsBetweenStations('Red', 'Alewife', 'Red', 'South Station') // 7
stopsBetweenStations('Red', 'South Station', 'Green', 'Kenmore') // 6

Note that the lines will be passed in as a single capitalized word ('Red', 'Green', 'Orange'). This can also be seein in detail by running the tests.

• Assume good input. Your function need not check the validity of the line or stop.
• Consider diagramming the lines by sketching out the subway lines and their stops and intersection.
• Subway lines are keys in a dictionary (object literal), while the values are a list (array) of all the stops on each line.
• The key to the practice is to find the intersection of the lines at Park Street.
• Solve an easier problem first.

Think about adding Haymarket before Government Center on the Green line then try to find a solution when there are multiple intersections.

Is there a way to decide if a particular solution is "correct"?

This bonus is completely optional and does not have tests, yet.

Developers should run these often!

• grunt nag or just grunt: runs code quality analysis tools on your code and complains.
• grunt make-standard: reformats all your code in a standard style.
• grunt test: runs any automated tests.

1. All content is licensed under a CC­BY­NC­SA 4.0 license.
2. All software code is licensed under GNU GPLv3. For commercial use or alternative licensing, please contact [email protected].