Name : Tote-betting-App Description - A Simple Horse Racing Betting App by Tabcorp

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. There app support three products with the following rules:

WIN

• 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.

PLACE

• 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.

#EXACTA

• 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.

Inputs :

1. Start Betting: A bet is has attributes: product, selections and stake where

• product is one of W, P, E
• selections is either a single runner number (e.g. 4 ) for Win and Place, or two runner numbers (e.g. 4,3) for Exacta
• stake is an amount in whole dollars (e.g. 35) For example Bet:W:3:5 is a $5 bet on horse 3 to win Bet:P:2:10 is a $10 bet on horse 2 to come either first, second or third Bet:E:5,7:15 is a $15 bet on horse 5 and 7 to come first and second in that order

2. Race Result: A Result is has attributes: first, second and third For example Result:5:3:8 represents a race where horse 5 finished first, horse 3 finished second and horse 8 finished third.

Output :

Output is dividends which are shown in following format product:winning selection:dividend For example W:2:$2.61 # Win bet on horse 2 yields $2.61 P:2:$1.06 # Place bet on horse 2 yields $1.06 P:3:$1.27 # Place bet on horse 3 yields $1.27 P:1:$2.13 # Place bet on horse 1 yields $2.13 E:2,3:$2.43 # Exacta on horses 2,3 yields $2.43

#Compile and Run:

• Clone the respository.
• Run npm install.
• Run node . for starting app at localhost:3000 port.
• Go to url http://localhost:3000/
• Click on Start Race button. It will create a unique Race Id and redirect to race page. On Race page, there will be 4 buttons - 'Start betting' -> Put a bet using it. 'Enter Result', -> Put the result once Race end. 'Show Dividend' -> Get dividend for Race. 'Back to Home Page' -> Back to Home page to start a new Race.
• Run mocha for testcases.

#Future Scope:

• Replace Mongo db with File structure for better data handling.
• Introduce get, put and delete routes to allow cutomer modify the bets before race end.
• Show ongoing races tab and do context switching to handle parallel races in a better way.