function* generatorFunction() {
    console.log('Start');
    yield 'First yield';
    console.log('After first yield');
    yield 'Second yield';
    console.log('After second yield');
}

const gen = generatorFunction();

console.log(gen.next()); // { value: 'First yield', done: false }
console.log(gen.next()); // { value: 'Second yield', done: false }
console.log(gen.next()); // { value: undefined, done: true }

function* range(start, end) {
    for (let i = start; i <= end; i++) {
        yield i;
    }
}

const iterator = range(1, 5);

for (const value of iterator) {
    console.log(value); // 輸出 1, 2, 3, 4, 5
}

function mockApiCall(delay, result) {
    return new Promise(resolve => setTimeout(() => resolve(result), delay));
}

async function* asyncGenerator() {
    console.log('Starting first request...');
    const data1 = await mockApiCall(1000, 'Data from first request');
    yield data1;

    console.log('Starting second request...');
    const data2 = await mockApiCall(1000, 'Data from second request');
    yield data2;
}

(async () => {
    const gen = asyncGenerator();
    console.log(await gen.next().value); // Data from first request
    console.log(await gen.next().value); // Data from second request
})();

function* infiniteSequence() {
    let i = 0;
    while (true) {
        yield i++;
    }
}

const seq = infiniteSequence();

console.log(seq.next().value); // 0
console.log(seq.next().value); // 1
console.log(seq.next().value); // 2
// 可以無(wú)限調(diào)用 next()

function* exampleGenerator() {
    try {
        yield 'First yield';
    } catch (e) {
        console.error('Caught an error:', e);
    }
    yield 'Second yield';
}

const gen = exampleGenerator();
console.log(gen.next()); // { value: 'First yield', done: false }
gen.throw(new Error('Something went wrong')); // Caught an error: Error: Something went wrong
console.log(gen.next()); // { value: 'Second yield', done: false }