async-iteration-test.js

// node --harmony-async-iteration async-iteration-test.js

// for-await-of converts sync iterables over Promises to async iterables over fulfillment values
// Iterable<Promise<T>> -> AsyncIterable<T>
// Roughly: { value: Promise.resolve(123), done: false } becomes Promise.resolve({ value: 123, done: false })

// Spec: https://tc39.github.io/proposal-async-iteration/#sec-createasyncfromsynciterator

function* gen() {
    yield Promise.resolve(1);
    yield Promise.resolve(2);
}

async function main() {
  for await (const x of gen()) {
    console.log(x);
  }
}

main();

// Output:
// 1
// 2

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