@prestamype/financial-functions/dist/_lib/Payment.js

Implementación de funciones financieras

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

/**
 * Interface -> amort_payment function
 * @param {Number} amount
 * @param {Number} nper
 * @param {Number} commission_rate
 * @param {Number} i_rate
 *
 */
class Payment {
  static get_base_amortization(amount, nper, i_rate) {
    return amount / (((1 + i_rate) ** nper - 1) / i_rate);
  }

  static gen_schedule(amount, nper, i_rate, commission_rate) {
    var amort_amount = this.amort_payment(amount, commission_rate);
    var base_amort = this.get_base_amortization(amort_amount, nper, i_rate);
    var total_amount = amount + amount * commission_rate;
    var res = Array.from({
      length: nper
    }, () => 0).reduce((c, a, i) => {
      var item = {
        i: c.amount * i_rate,
        amortization: base_amort * (1 + i_rate) ** i
      };
      return {
        schedule: [...c.schedule, item],
        amount: c.amount - item.amortization
      };
    }, {
      schedule: [],
      amount: total_amount
    });
    var payments = res.schedule.map(a => {
      a.fee = a.i + a.amortization;
      return a;
    });
    payments[payments.length - 1].fee += res.amount;
    return {
      payments,
      total_amount
    };
  }

}

exports.default = Payment;
module.exports = exports.default;