Bowling in ECMAScript
Score a bowling game
exercism fetch ecmascript bowling
Score a bowling game.
Bowling is game where players roll a heavy ball to knock down pins arranged in a triangle. Write code to keep track of the score of a game of bowling.
A game consists of 10 frames. A frame is composed of one or two balls thrown, with 10 pins standing at the start of the frame. There are three cases for the tabulation of a frame:
An open frame is where a score of less than 10 is recorded for the frame. In this case the score for the frame is the number of pins knocked down after the second throw.
A spare is where all ten pins are knocked down after the second throw. The total value of a spare is 10 plus the number of pins knocked down in the next throw.
A strike is where all ten pins are knocked down after the first throw. The total value of a strike is 10 plus the number of pins knocked down in the next two throws. If a strike is immediately followed by another strike, then the first strike's value cannot be totalled until the next throw.
Here is a three frame example:
|Frame 1||Frame 2||Frame 3|
|X (strike)||5/ (spare)||9 0 (open frame)|
Frame 1 is (10 + 5 + 5) = 20
Frame 2 is (5 + 5 + 9) = 19
Frame 3 is (9 + 0) = 9
This means the current running total is 48.
The tenth frame in the game is a special case. If the player throws a strike or a spare, then they get one extra throw called a fill ball. Fill balls exist to calculate the total of the 10th frame. Scoring a strike or spare on the fill ball does not give the player more fill balls. The total value of the 10th frame is the total number of pins knocked down.
For a tenth frame of X1/ (strike and a spare), the total value is 20.
For a tenth frame of XXX (three strikes), the total value is 30.
Go through the setup instructions for ECMAScript to install the necessary dependencies:
Install assignment dependencies:
$ npm install
Write code to keep track of the score of a game of bowling. It should support two operations:
roll(pins : int)is called each time the player rolls a ball. The argument is the number of pins knocked down.
score() : intis called only at the very end of the game. It returns the total score for that game.
Making the test suite pass
Execute the tests with:
$ npm test
In the test suites all tests but the first have been skipped.
Once you get a test passing, you can enable the next one by
The Bowling Game Kata at but UncleBob http://butunclebob.com/ArticleS.UncleBob.TheBowlingGameKata
Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.