Dividends Calculator (Tote Betting)

This is a dividends calculator for a simplified form of Tote betting.

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. The betting house takes a commission out of the pool before it is split between winning punters

Running Locally

git clone https://github.com/juliuscarvajal/dividendscalculator.git
cd dividendscalculator
npm install
npm start

Tested on Mac and Windows 8.

Running the tests

npm test

Usage

Input bets with the following format:

Bet:<bet type>:<selections>:<stake>

where

• <bet type> is one of W, P, E
• <selection> 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 first, second or third
Bet:E:5,7:15 is a $15 bet on horses 5 and 7 to come first and second in that order

Input result with the following format:

Result:<first>:<second>:<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 (automatically displayed after result input)

<bet type>:<winning selection/s>:<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

Exit

x

Then press enter.

Try It

1. Just copy all the bets here with the result input below.
2. Paste it on your console.
3. Press enter to output the dividends.

Bet:W:1:3
Bet:W:2:4
Bet:W:3:5
Bet:W:4:5
Bet:W:1:16
Bet:W:2:8
Bet:W:3:22
Bet:W:4:57
Bet:W:1:42
Bet:W:2:98
Bet:W:3:63
Bet:W:4:15
Bet:P:1:31
Bet:P:2:89
Bet:P:3:28
Bet:P:4:72
Bet:P:1:40
Bet:P:2:16
Bet:P:3:82
Bet:P:4:52
Bet:P:1:18
Bet:P:2:74
Bet:P:3:39
Bet:P:4:105
Bet:E:1,2:13
Bet:E:2,3:98
Bet:E:1,3:82
Bet:E:3,2:27
Bet:E:1,2:5
Bet:E:2,3:61
Bet:E:1,3:28
Bet:E:3,2:25
Bet:E:1,2:81
Bet:E:2,3:47
Bet:E:1,3:93
Bet:E:3,2:51
Result:2:3:1

It should output the following:

==============
Win:2:$2.61
==============
Place:2:$1.06
==============
Place:3:$1.27
==============
Place:1:$2.13
==============
Exacta:2,3:$2.43

Supported bet types

It currently supports the following bet types:

1. WIN - Punters must choose the winner of a race - House takes a 15% commission from the Win pool - The remaining total is split, proportionally to stake, amongst punters who chose the correct winning horse.
2. PLACE - Punters must choose the first, second or third place horse in a race - House 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
3. EXACTA - Punters must choose the first and second place runners in a race in the correct order - House 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, the house publishes the dividends for each bet type. This is the return for a $1 stake for each paying selection in the race. All dividends are calculated to the nearest $0.01.