To run:

npm install
node
 > .load runRound.cjs

If you uncommented lines for node demo, comment them out when running tests.

Demo:

For the purpose of this demo, I created a showBreakdown function. To use this you need to uncomment an import statement and 3 lines in addRoll method of round.js.

Welcome to Node.js v17.4.0.
Type ".help" for more information.
> .load round.js
  [round.js content - deleted]
> let round = new Round();
undefined
> round = new Round();
Round { frames: [] }
> round.addRoll(3)
| 3    |
| 3    |
'Total score is: 3'
> round.addRoll(7)
| 3 /  |
| 10   |
'Total score is: 10'
> round.addRoll(5)
| 3 /  | 5    |
| 15   | 5    |
'Total score is: 20'
> round.addRoll(4)
| 3 /  | 5 4  |
| 15   | 9    |
'Total score is: 24'
> round.addRoll(10)
| 3 /  | 5 4  | 10 X |
| 15   | 9    | 10   |
'Total score is: 34'
> round.addRoll(10)
| 3 /  | 5 4  | 10 X | 10 X |
| 15   | 9    | 20   | 10   |
'Total score is: 54'
> round.addRoll(7)
| 3 /  | 5 4  | 10 X | 10 X | 7    |
| 15   | 9    | 27   | 17   | 7    |
'Total score is: 75'
> round.addRoll(2)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  |
| 15   | 9    | 27   | 19   | 9    |
'Total score is: 79'
> round.addRoll(0)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0    |
| 15   | 9    | 27   | 19   | 9    | 0    |
'Total score is: 79'
> round.addRoll(0)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  |
| 15   | 9    | 27   | 19   | 9    | 0    |
'Total score is: 79'
> round.addRoll(0)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0    |
| 15   | 9    | 27   | 19   | 9    | 0    | 0    |
'Total score is: 79'
> round.addRoll(10)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0 /  |
| 15   | 9    | 27   | 19   | 9    | 0    | 10   |
'Total score is: 89'
> round.addRoll(7)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0 /  | 7    |
| 15   | 9    | 27   | 19   | 9    | 0    | 17   | 7    |
'Total score is: 103'
> round.addRoll(1)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0 /  | 7 1  |
| 15   | 9    | 27   | 19   | 9    | 0    | 17   | 8    |
'Total score is: 104'
> round.addRoll(10)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0 /  | 7 1  | 10 X |
| 15   | 9    | 27   | 19   | 9    | 0    | 17   | 8    | 10   |
'Total score is: 114'
> round.addRoll(10)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0 /  | 7 1  | 10 X | 10 X |
| 15   | 9    | 27   | 19   | 9    | 0    | 17   | 8    | 20   | 10   |
'Total score is: 134'
> round.addRoll(5)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0 /  | 7 1  | 10 X | 10 X |
| 15   | 9    | 27   | 19   | 9    | 0    | 17   | 8    | 25   | 15   |
'Total score is: 144'
> round.addRoll(10)
Uncaught 'invalid bonus'
> round.addRoll(5)
| 3 /  | 5 4  | 10 X | 10 X | 7 2  | 0 0  | 0 /  | 7 1  | 10 X | 10 X |
| 15   | 9    | 27   | 19   | 9    | 0    | 17   | 8    | 25   | 20   |
'Total score is: 149'
> round.addRoll(5)
Uncaught 'round finished'

Features:

• user can add one roll at a time using ‘addRoll(points) method’
  • the points are validated
  • when the round is complete, 'round complete' will be thrown
• for the purpose of the demo, you can see a scorecard and final score (the project was create the logic without a UI)
• the score will be updated each roll

How the score is counted

1. The user inputs the roll
2. The program checks all existing frames for outstanding bonus rolls
3. The program creates a Frame if it is a strike, awaits another roll otherwise.

Reflections:

Edge cases:

• given 2 strikes in a row, the first strike still has one bonus roll left

• given a strike in the 10th frame, 2 bonus rolls are allowed

(TBC)...

Bowling rules model: