使用Javascript计算IRR

function calculateIRR(cashFlows, guess = 0.1, maxIterations = 100, tolerance = 1e-7) {
    let iteration = 0;
    let npv;
    let irr = guess;
    do {
        iteration++;
        npv = 0;
        for (let i = 0; i < cashFlows.length; i++) {
            npv += cashFlows[i] / Math.pow(1 + irr, i);
        }
        let irrNew = irr + (npv > 0 ? -guess : guess) / (npv / Math.abs(npv));
        if (Math.abs(irrNew - irr) < tolerance) {
            return irrNew;
        }
        irr = irrNew;
    } while (iteration < maxIterations);
    throw new Error('IRR calculation did not converge');
}

// 示例现金流
const cashFlows = [-1000, 200, 300, 400, 500]; // 第一个值是初始投资，后续是每年的现金流

try {
    const irr = calculateIRR(cashFlows);
    console.log(`IRR is ${irr.toFixed(4) * 100}%`);
} catch (error) {
    console.error(error.message);
}