ES6 Generators

LunchNLearn-ES6Generators.js

"use strict";

var coolPeople = {};
coolPeople[Symbol.iterator] = function* () {
  yield "Supriya";
  yield "Andy (Basu)";
  yield "Sachin";
  yield "Tom";
};


function* boringPeople() {
  yield* ["Juan", "Jackies", "Ritesh", "Mark"];
};


class Amortization {
  constructor(principal, annualRate, months) {
      this.principal = principal;
      this.annualRate = annualRate;
      this.months = months;
      this.monthlyRate = this.annualRate/(12*100);
  }

  getMonthlyPayment() {
    let totalInterest = Math.pow(1 + this.monthlyRate, this.months);
    return (this.monthlyRate * this.principal * totalInterest)/(totalInterest - 1);
  }
  
  * getTable() {
    let currentMonth = 1;
    let currentPrincipal = this.principal;
    let monthlyPayment = this.getMonthlyPayment();
    while(currentMonth <= this.months) {
      let currentMonthInterest = currentPrincipal * this.monthlyRate;
      let currentMonthPrincipal = monthlyPayment - currentMonthInterest;
      yield { currentMonth, monthlyPayment, currentMonthPrincipal, currentMonthInterest };
      currentPrincipal -= currentMonthPrincipal;
      currentMonth++;
    }
  }
}

console.log(typeof coolPeople);
console.log(typeof boringPeople);

for(let coolPerson of coolPeople) {
  console.log(`${coolPerson} is cool.`);
}

for(let boringPerson of boringPeople()) {
  console.log(`${boringPerson} is boring.`)
}

var amortizationInstance = new Amortization(100000, 10, 12, 0, 0);
console.log(amortizationInstance.getMonthlyPayment());

for (let amortization of amortizationInstance.getTable()) {
  console.log(`Month: ${amortization.currentMonth} - Payment: ${amortization.monthlyPayment} - Interest: ${amortization.currentMonthInterest} - Principal: ${amortization.currentMonthPrincipal}`);
}