fake-stock-market-generator/index.js

Generates FAKE price data that can be used to simulate a stock market

let faker = require('faker');

exports.generateStockData = function(numberOfMinutes) {
    let symbol = makeUpSymbol();
    let companyName = faker.company.companyName();
    let catchPhrase = faker.company.catchPhrase();
    let priceData = generatePriceData(numberOfMinutes);
    let returnObject = {symbol, companyName, catchPhrase, priceData};
    console.log(returnObject);
    return returnObject;
}

makeUpSymbol = () => {
    let length = Math.floor(Math.random() * 3) + 1
    let result = '';
    let characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    let charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
       result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    return result;
}

generatePriceData = (numberOfMinutes) => {
    let startingPrice = Number(Math.floor(Math.random() * 1000) + 1);
    let marketWeighting = Number(Math.random() * 2) + -1;
    let volatility = Number(Math.random() * 10) + 1;
    let priceDataArray = [];
    for(let x = 0; x < numberOfMinutes; x++) {
        let maxMovement = Number((startingPrice * 0.1 ) + (volatility * marketWeighting));
        priceDataArray.push({minute:x, price:Number(startingPrice.toFixed(2))});
        let movement = Number(maxMovement * Math.random());
        movement = Number(Math.random() < 0.5) ? -Math.abs(movement) : Math.abs(movement);
        let significantMovement = Number(Math.random() < 0.01) ? 10 : 1;
        startingPrice = Number(startingPrice + movement * significantMovement);
    }
    return priceDataArray;
}