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Ten Pin Bowling Game Calculator

Description

This project was generated with

  • @angular/cli 16.1.4
  • @angular/material 16.1.5
  • rxjs 7.8.1
  • typescript 5.1.6

This calculates the score during a game of ten pin bowling. So first we need latest Angular to run this application.

Angular CLI: 16.1.4 Node: 18.13.0 Package Manager: npm 9.5.0

Prerequisities

  • Created this application with latest Angular.
  • Styling done in a pre-processor sass.
  • Checked whether the application is responsive and works good in the browsers (Chrome, FF, Safari)

Development server

  • Run npm i @angular/cli

  • npm i

  • Run ng serve for a dev server. Navigate to http://localhost:4200/.

Running unit tests

Run ng test to execute the unit tests via Karma.

Have used ngrx for state management to store the following

  • Frame Count
  • Total Score
  • Each roll with respect to the frame and its score

Game Rules

  • A game consists of ten frames. Frame 1-9 are composed of two rolls.

  • If the user strikes in the first roll, then the second roll will not be played and moves to next frame.

  • Frame 10 can be composed of up to three rolls depending on if the first rolls in the frame is a strike or a spare.

  • Each frame can have one of three marks:

    • Strike: all 10 pins where knocked down with the first roll.
    • Spare: all 10 pins where knocked down using two rolls.
    • Open: some pins where left standing after the frame was completed.

  • When calculating the total score, the sum of the score for each frame is used.

    • For an open frame the score is the total number of pins knocked down.
    • For a strike, the score is 10 + the sum of the two rolls in the following frame.
    • For a spare, the score is 10 + the number of pins knocked down in the first roll of the following frame.

  • The tenth frame may be composed of up to three rolls: the bonus roll(s) following a strike or spare in the tenth (sometimes referred to as the eleventh and twelfth frames) are fill ball(s) used only to calculate the score of the mark rolled in the tenth.

Test case written for the following possible scenarios

  • -/- || -/- || -/- || -/- || -/- || -/- || -/- || -/- || -/- || -/- || = 0 (all null)

  • 1/1 || 1/1 || 1/1 || 1/1 || 1/1 || 1/1 || 1/1 || 1/1 || 1/1 || 1/1 || = 20 (all 1)

  • 10 || 10 || 10 || 10 || 10 || 10 || 10 || 10 || 10 || 10 || 10 || 10 || = 300 (all strike)

  • 4/6 || 3/2 || -/- || -/- || -/- || -/- || -/- || -/- || -/- || -/- || = (10 + 3) + 5 = 18 (NULL ROLLS 16 )(spare)

  • 10 || 3/2 || -/- || -/- || -/- || -/- || -/- || -/- || -/- || -/- || = (10 + 3 + 2)+ (3 + 2) = 20 (NULL ROLLS 17 )(strike)

Validations added for the following scenarios

  • Frame count should not exceed 10
  • If it is a strike then roll 2 should not be given
  • For 10th frame roll 3 will be given if it is a strike / spare