arpad

Arpad: ELO Rating System for Node.js

This is an implementation of ELO for Node.js (ELO is named after Arpad Elo, hence the package name).

There seems to be just one other implementation of ELO for Node.js, but it appears to be overly simple and unmaintained.

Installation

npm install arpad

Simple Usage

var Elo = require('./index.js');

var elo = new Elo(32);

var alice = 1600;
var bob = 1300;

var odds_of_alice_winning = elo.expectedScore(alice, bob);
alice = elo.newRating(odds_of_alice_winning, 1, alice);

console.log("Alice's new score:", alice);

Running Tests

First install mocha

npm install -g mocha

Then run either of the following from the root of the repository

npm test
mocha

License

MIT