אסינכרון / ממתין

async function forty() {
  return 40;
}

forty(); // Promise { 40 }
forty().then((v) => console.log(v)); // 40

async function sum() {
  const a = await Promise.resolve(10);
  const b = await Promise.resolve(20);
  return a + b; // 30
}

function sum() {
  return Promise.resolve(10).then((a) => Promise.resolve(20).then((b) => a + b));
}

async function read() {
  try {
    const x = await Promise.reject(new Error('no'));
    return x;
  } catch (err) {
    return 'error: ' + err.message;
  }
}

read(); // Promise { 'error: no' }

const double = async (n) => n * 2;
double(5); // Promise { 10 }