A JavaScript module to help with calculations of stocks and portfolios in an object oriented way. Stocks data is obtained from Fintual API.
(async function() {
// Previous transactions in the portfolio
const transactions = [{ date: '2018-08-01', quantity: 10, stockId: '187' }];
// Build the portfolio.
const portfolio = new Portfolio(transactions);
// Initialize the stocks data
await portfolio.init();
// Add more transactions
await portfolio.addTransaction('2018-12-01', '187', 15);
// Calculate the profit
const profit = await portfolio.profitOnPeriod('2018-08-01', '2018-12-01');
const annualizedProfit = await portfolio.annualizedProfitOnPeriod('2018-08-01', '2018-12-01');
console.log(profit, annualizedProfit);
})();Check out example app.