Arbitrage Check

arbitrage_check.js

/**
 * Check for arbitrage bet.
 *
 * @class Arbitrage
 */

var Arbitrage = Arbitrage || {};

var args = [];

process.argv.forEach(
    function (value, index) {
        if (index > 1) {
            args.push(parseFloat(value));
        }
    }
);


/**
 *
 * @method arbitrageCheck
 *
 * @param [name] {Array} Coefficients numbers
 * for given bet. Should be two or more.
 *
 * @return {Number} Under or over 100. Under
 * would mean arbitrage, over would mean no
 * arbitrage.
 *
 * @example
 *      Arbitrage.arbitrageCheck(1.69, 4.50, 6.50); // 96.78 which means ~3.22% profit (100 - 96.78)
 *
 */
Arbitrage.arbitrageCheck = function () {
    var total = 0;

    [].forEach.call(arguments,
        function (value, index) {
            total += 1 / value;
        }
    );

    return total * 100;
}

console.log(Arbitrage.arbitrageCheck.apply(null, args).toFixed(2));