JavaScript ???? ?? ????. ?? ??? ????? ???? ????. ?? ??? ? ??? ?? ??????, ? ??? ?? ??? ?? ?? ???? ??? ????? ????? ????.

???? ???????. ???? ?? ???? ?? ??? ? ?? ?????. function* ??? ?? ???? ?????. ??? ??? ????.

function* countToThree() {
  yield 1;
  yield 2;
  yield 3;
}

const counter = countToThree();
console.log(counter.next().value); // 1
console.log(counter.next().value); // 2
console.log(counter.next().value); // 3

? ?? ??? ??? ???? ??? ?????. ?? ???? ????.

??? ???? ??? ???? ? ??? ?? ? ? ????. ??? ?? ???? ??? ? ?????. ???? ??? ???? ??? ??? ?????.

function* fibonacci() {
  let [prev, curr] = [0, 1];
  while (true) {
    yield curr;
    [prev, curr] = [curr, prev + curr];
  }
}

const fib = fibonacci();
for (let i = 0; i < 10; i++) {
  console.log(fib.next().value);
}

? ???? ???? ???? ?? ?????. ?? ????? ??? ?? ?????.

?????? ?? ?? ? ? ??? ??? ??? ?????. ??? ??? ??? ?? ?? ?????. ?? ??? ??? ??? ??? ??? ?? ???? ? ????.

? ???? ?? ???????. ??? ?????? ?? ??? ?? ???? ????? ??? ?????.

function* paginate(items, pageSize) {
  for (let i = 0; i < items.length; i += pageSize) {
    yield items.slice(i, i + pageSize);
  }
}

const allItems = Array.from({ length: 100 }, (_, i) => i + 1);
const pageSize = 10;
const pages = paginate(allItems, pageSize);

console.log(pages.next().value); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
console.log(pages.next().value); // [11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

? ???? ???? ?? ?? ???? ? ?? ??? ?? ?? ??? ??? ??? ???? ??? ? ????.

???? ??? ???????? ?? ????. ??? ??? ?? ???? ??? ????? ?? ? ????. ??? co ?????? ???? ????.

const co = require('co');

function* fetchUserData() {
  const user = yield fetchUser();
  const posts = yield fetchPosts(user.id);
  const comments = yield fetchComments(posts[0].id);
  return { user, posts, comments };
}

co(fetchUserData).then(result => {
  console.log(result);
}).catch(error => {
  console.error(error);
});

? ??? ????? ???? ???? 3?? ??? ??? ???? ????. ???? ??? ??? ??? ? ???? ?? ?????.

???? ???? ??????? ??? ? ????. ?? ???? ???? ??? ?? ???? ?? ??? ?????? ? ????.

function* task1() {
  yield 'Start task 1';
  yield 'Middle of task 1';
  yield 'End task 1';
}

function* task2() {
  yield 'Start task 2';
  yield 'Middle of task 2';
  yield 'End task 2';
}

function run(tasks) {
  const iterations = tasks.map(task => task());
  while (iterations.length) {
    const [first, ...rest] = iterations;
    const { value, done } = first.next();
    if (!done) {
      console.log(value);
      iterations.push(first);
    }
    iterations.unshift(...rest);
  }
}

run([task1, task2]);

? ??? ? ??? ??? ?? ? ?? ? ??? ?????.

???? ?? ??? ???? ??? ?????. ? ???? ?? ?? ??? ??? ? ????.

function* trafficLight() {
  while (true) {
    yield 'red';
    yield 'green';
    yield 'yellow';
  }
}

const light = trafficLight();
console.log(light.next().value); // red
console.log(light.next().value); // green
console.log(light.next().value); // yellow
console.log(light.next().value); // red

? ???? ???? ?? ??? ?????.

?? ? ? ??? ??? ?? ???? ?????. ??? ??? ?? ?? ???? ??? ? ????:

function* innerGenerator() {
  yield 'inner 1';
  yield 'inner 2';
}

function* outerGenerator() {
  yield 'outer 1';
  yield* innerGenerator();
  yield 'outer 2';
}

const gen = outerGenerator();
console.log(gen.next().value); // outer 1
console.log(gen.next().value); // inner 1
console.log(gen.next().value); // inner 2
console.log(gen.next().value); // outer 2

yield* ??? innerGenerator? ???? externalGenerator? ???? ?? ?? ?? ?????.

???? ?? ??? ??? ??? ????. throw() ???? ???? ???? ??? ?? ? ????.

function* errorGenerator() {
  try {
    yield 'Start';
    yield 'Middle';
    yield 'End';
  } catch (error) {
    console.error('Caught:', error);
    yield 'Error handled';
  }
}

const gen = errorGenerator();
console.log(gen.next().value); // Start
console.log(gen.throw(new Error('Oops!')).value); // Caught: Error: Oops!
                                                  // Error handled

?? ?? ?? ??? ?? ?? ??? ???????.

???? ???? ??? ????? ??? ?? ????. ??? ??? ?? ?? ??? ???? ??? ????.

function* countToThree() {
  yield 1;
  yield 2;
  yield 3;
}

const counter = countToThree();
console.log(counter.next().value); // 1
console.log(counter.next().value); // 2
console.log(counter.next().value); // 3

? ???? ??? ??? ?? 2?? ??? ?????.

???? ?? ?? ??? ?? ? ??? ??? ???? ???? ????. ??? ?? ???? ???? ??? ?? ?????? ?? ? ????. ??? ??? ??? ? ?? ???? ????.

function* fibonacci() {
  let [prev, curr] = [0, 1];
  while (true) {
    yield curr;
    [prev, curr] = [curr, prev + curr];
  }
}

const fib = fibonacci();
for (let i = 0; i < 10; i++) {
  console.log(fib.next().value);
}

? ???? ??? ? ?? ???? ??? ??? ???? ??? ???? ??? ??? ? ????.

???? ???? Observable ??? ??? ?? ????. ??? ??? ??? ????.

function* paginate(items, pageSize) {
  for (let i = 0; i < items.length; i += pageSize) {
    yield items.slice(i, i + pageSize);
  }
}

const allItems = Array.from({ length: 100 }, (_, i) => i + 1);
const pageSize = 10;
const pages = paginate(allItems, pageSize);

console.log(pages.next().value); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
console.log(pages.next().value); // [11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

? ???? ??? ??? ?? ??? ? ???? ?????.

?????? ? ?? ?? ??? ??? ?? ?? ??? ??? ????. ??? ???? ???? ??? ??? ????.

const co = require('co');

function* fetchUserData() {
  const user = yield fetchUser();
  const posts = yield fetchPosts(user.id);
  const comments = yield fetchComments(posts[0].id);
  return { user, posts, comments };
}

co(fetchUserData).then(result => {
  console.log(result);
}).catch(error => {
  console.error(error);
});

? ??? ??? ???? ??? ?? maxAttempts ??? ??? ??? ?????.

????? ???? ?? ???? ???? ????? ?? ??? ?? ??? ???? ? ??? ?? JavaScript? ??? ?????. ??? ?? ??? ????, ??? ??? ????, ??? ??? ??? ???? ? ?????. ???? ?? ??? ?? ?? ???, ?? ????? ?????? ?? ??? ? ?? ?? ??? ???? ??? ???? ? ????. ?? ?? JavaScript ?????? ???? ??? ???. ??? ??? ???? ? ??? ?? ?? ????!

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? ??? JavaScript ???: ?? ?? ???? ??? ?????!? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!