function sum(a, b) {
  return a + b;
}

console.log(sum(1, 1));
console.log(sum(2, 2));
console.log(sum(3, 3));

//=>
// 2
// 4
// 6

async function sumAsync(a, b) {
  return a + b;
}

sumAsync(1, 1).then(res => console.log(res));
sumAsync(2, 2).then(res => console.log(res));
sumAsync(3, 3).then(res => console.log(res));

//=>
// 2
// 4
// 6

function sum(a, b) {
  return a + b;
}

async function sumAsync(a, b) {
  return a + b;
}

console.log(sum(1, 1));
sumAsync(2, 2).then(res => console.log(res));
console.log(sum(3, 3));

//=>
// 2
// 6
// 4

async function sumAsync(a, b) {
  return a + b;
}

sumAsync(1, 1).then(res => console.log(res));
sumAsync(2, 2).then(res => console.log(res));
sumAsync(3, 3).then(res => console.log(res));

//=>
// 2
// 6
// 4

async function sumAsync(a, b) {
  return a + b;
}

async () => {
  const result = [];
  result.push(await sumAsync(1, 1));
  result.push(await sumAsync(2, 2));
  result.push(await sumAsync(3, 3));
  console.log(result); //=> [ 2, 4, 6 ]
};

async function subtraction(a, b) {
  const result = a - b;
  if (result) return result;
  else throw new Error('Whoops!');
}

(async () => {
  try {
    const result = await subtraction('a', 1);
    console.log(result);
  } catch (err) {
    console.log(err);
  }
})();

//=> Error: Whoops!
//    at subtraction (<anonymous>:6:11)
//    at <anonymous>:11:26
//    at <anonymous>:16:3

async function sumAsync(a, b) {
  return a + b;
}

(async () => {
  const promises = [sumAsync(1, 1), sumAsync(2, 2), sumAsync(3, 3)];
  const result = await Promise.all(promises);
  console.log(result); //=> [ 2, 4, 6 ]
})();

async function getJSON(url) {
  const response = await fetch(url);
  const json = await response.json();
  return json;
}

(async () => {
  const cep = await getJSON('https://viacep.com.br/ws/01001000/json/');
  console.log(cep.localidade); //=> São Paulo
})();