zlatkov

async function* makeFibonacciSequenceGenerator(endIndex = Infinity) {
    let previousNumber = 0;
    let currentNumber = 1;
    
    for (let currentIndex = 0; currentIndex < endIndex; currentIndex++) {
        await new Promise(resolve => setTimeout(resolve, 1000)); // a simple timeout as an example.
        yield currentNumber;
        let nextNumber = currentNumber + previousNumber;
        previousNumber = currentNumber;
        currentNumber = nextNumber;

zlatkov

let fibonacciSequenceGenerator = makeFibonacciSequenceGenerator(50);

console.log(fibonacciSequenceGenerator.next().value); // 1
console.log(fibonacciSequenceGenerator.next(3).value); // 5
console.log(fibonacciSequenceGenerator.next().value);   // 8
console.log(fibonacciSequenceGenerator.return(374).value); // 374
console.log(fibonacciSequenceGenerator.next(1).value); // undefined

zlatkov

function* makeFibonacciSequenceGenerator(endIndex = Infinity) {
    let previousNumber = 0;
    let currentNumber = 1;
    let skipCount = 0;
    
    try {
      for (let currentIndex = 0; currentIndex < endIndex; currentIndex++) {
          if (skipCount === 0) {
              skipCount = yield currentNumber;
              skipCount = skipCount === undefined ? 0 : skipCount;

zlatkov

function* makeFibonacciSequenceGenerator(endIndex = Infinity) {
    let previousNumber = 0;
    let currentNumber = 1;
    let skipCount = 0;
    
    for (let currentIndex = 0; currentIndex < endIndex; currentIndex++) {
        if (skipCount === 0) {
            skipCount = yield currentNumber; // skipCount is the parameter passed through the invocation of `fibonacciSequenceGenerator.next(value)` below.
            skipCount = skipCount === undefined ? 0 : skipCount; // makes sure that there is an input
        } else if (skipCount > 0){

zlatkov

function* makeFibonacciSequenceGenerator(endIndex = Infinity) {
    let previousNumber = 0;
    let currentNumber = 1;
    
    for (let currentIndex = 0; currentIndex < endIndex; currentIndex++) {
        yield currentNumber;
        let nextNumber = currentNumber + previousNumber;
        previousNumber = currentNumber;
        currentNumber = nextNumber;
    }

zlatkov

let fibonacciSequenceIterator = makeFibonacciSequenceIterator(5);

for (let x of fibonacciSequenceIterator) {
    console.log(x); //1 1 2 3 5 8
}

zlatkov

function makeFibonacciSequenceIterator(endIndex = Infinity) {
  let currentIndex = 0;
  let previousNumber = 0;
  let currentNumber = 1;

  let iterator = {};
  iterator[Symbol.iterator] = () => {
    return {
      next: () => {
        if (currentIndex >= endIndex) { 

zlatkov

let fibonacciSequenceIterator = makeFibonacciSequenceIterator(5);

for (let x of fibonacciSequenceIterator) {
    console.log(x);
}

zlatkov

let fibonacciSequenceIterator = makeFibonacciSequenceIterator(5); // Generates the first 5 numbers.
let result = fibonacciSequenceIterator.next();
while (!result.done) {
    console.log(result.value); // 1 1 2 3 5 8
    result = fibonacciSequenceIterator.next();
}

zlatkov

function makeFibonacciSequenceIterator(endIndex = Infinity) {
  let currentIndex = 0;
  let previousNumber = 0;
  let currentNumber = 1;

  return {
    next: () => {
      if (currentIndex >= endIndex) { 
          return { value: currentNumber, done: true }; 
      }