The project is to demo calculation of the dividends for a simplified form of Tote betting using Angular 4, bootstrap 4, SCSS, CSS3 and HTML5.
This is a simple demo web application project, so we only have a tote-bet feature module and a shared module under the root app module.
The shared module has reusable pipes, directives, etc. for other feature modules.
The tote-bet feature module contains bet-panel UI component, services, models, etc. The bet-panel component allows user to input bets and results data, load example data and submit the data to generate the dividends output.
To make sure that it is easy to modify the calculator logic of Win, Place and Exacta products and add new products in future, this project uses Command design pattern to separate the calculator logic into the following individual calculator services such as:
- win-cal.service.ts
- place-cal.service.ts
- exacta-cal.service.ts
The calculator services all implements CalculatorInterface, which specifies the calculateDividends() method to calculate dividend. The Bet model and Dividend model in the calculateDividends method signature are generic for the three products, so all products can implement the same method. The dividend.service.ts provides a calculators array to allow developer register calculator services and those registered calculators will be used calculate dividends of all products automatically.
To add a new calculator, you can just simply add a new service that implements CalculatorInterface and register it in the calculators array of DividendService.
This project have dependencies that require Node 6.9.0 or higher, together with NPM 3 or higher.
BEFORE YOU INSTALL: please read the prerequisites
npm installRun ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.
Run ng test to execute the unit tests via Karma.
Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|module.
Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the -prod flag for a production build.
Run ng e2e to execute the end-to-end tests via Protractor.
Before running the tests make sure you are serving the app via ng serve.
Tote betting involves punters choosing the outcome of a race by placing bets into a pool of money. Punters who successfully predict the outcome of a race take a share of the pool proportional to their stake. For example, a punter who places a $2 bet on a winning selection would receive twice the winnings of a punter who placed a $1 stake. Tabcorp takes a commission out of the pool before it is split between winning punters.
The calculator must support three products with the following rules:
- Punters must choose the winner of a race
- Tabcorp takes a 15% commission from the Win pool
- The remaining total is split, proportionally to stake, amongst punters who chose the correct winning horse.
- Punters must choose the first, second or third place horse in a race
- Tabcorp takes a 12% commission from the Place pool
- The total pool is split evenly into 3 and each of these amounts is then split, proportionally to stake, amongst the punters who chose each placed horse
- Punters must choose the first and second place runners in a race in the correct order
- Tabcorp takes an 18% commission from the Exacta pool
- The remaining total is split, proportionally to stake, amongst punters who chose the correct first and second horse in correct order
After a race has been run, Tabcorp publishes the dividends for each product. This is the return for a $1 stake for each paying selection in the race. All dividends are calculated to the nearest 0.01.