This is an implementation of a Bowling Score card used as a code exercise.

The rules of bowling represent an excellent use case for a code exercise as it requires you to consider the rules of the games and the quirky edge cases that go along with it.

This implementation comes in 2 flavors:

• an API
• a CLI (command line interface)

Both the CLI and API consume the same basic logic for computing the score of a bowling game. You can easily use the API from the swagger doc UI or by simply invoking it from the address bar of your browser. Of course, you can always use a Rest API client such as Postman as well.

Be sure you have NodeJS including Node Package Manager (npm) installed

From the project directory, simply run NPM's typical install command.

npm i

NPM will then pull down all of the dependencies into a node_modules folder

To run the API locally, simply run the command below. This will spin up an express server on port 3000:

npm run start

To check to make sure the server is up and running, Simply open your browser to http://localhost:3000/api. You should see simple JSON message indicating that the service is up and running:

{ "status": "pass" }

To see the documentation for the API, navigate to the following URL:

http://localhost:3000/api-docs

From the Swagger interface, you can optionally interact with the API. To calculate a score from a set of bowling throws, simply enter a comma delimited set of throws for each frame. Note that you must enter all throw values for each frame, even for a strike. You don't have to enter all frames though. The API will calcuate however many frames you enter (up to a max of 10 frames).

The following will give you the current score after a player knocks down 6 pins in the first frame:

http://localhost:3000/api/score?throws=6

Below is an example where we calculate the score after a player throws 2 strikes in a row in the first and second frames. Note that we must put a zero in the 2nd throw when a player throws a strike.

http://localhost:3000/api/score?throws=10,0,10,0

In this example, the player throws a spare in each of the first 2 frames and then knocks down a total of 9 (4+5) in the third frame.

http://localhost:3000/api/score?throws=3,7,8,2,5,4

This project includes a very rudimentary command line interface to provide a friendlier way to exercise the underlying scoring functionality. You can run this using the following command:

npm run start:cli

You will be presented with a series of questions. First, you'll be asked if you want to start a new game. Choosing "New Game" then begins a series of questions asking you how many pins were knocked down for each throw of each frame.

Once you're done entering in all of the throws, you'll be presented with a visual representation of the score card for that game.

If you want to end the game early at any point, simply choose hit ESC.

This application was developed with both Unit Test and Behavioral Tests.

The unit tests were developed using Jest and can be executed with the following command.

npm run test

The behavioral tests execute against the API. Running the following command will spin up an instance of the web service, execute the tests and then shut down the server.

npm run test:bdd

The code in this project is licensed under MIT license.