async await Promise.resolve

https://developers.google.com/web/fundamentals/primers/async-functions?hl=ko

async function logFetch(url) {
  try {
    const response = await fetch(url);
    console.log(await response.text());
  }
  catch (err) {
    console.log('fetch failed', err);
  }
}

await하는 것은 전부 Promise.resolve()를 통해 전달되므로, 기본 프라미스가 아닌 프라미스를 안전하게 await할 수 있습니다.

// wait ms milliseconds
function wait(ms) {
  return new Promise(r => setTimeout(r, ms));
}

async function hello() {
  await wait(1500);
  return 'world';
}
hello()
.then(function(r,j){ 
    console.info(r,j);
})
.catch(function(e){
    console.info(e); 
});

// ==== ==== ==== ==== ==== ==== ==== ==== ==== ==== ==== 

// wait ms milliseconds
function wait(ms) {
  return new Promise(r => setTimeout(r, ms));
}
async function foo() {
//  await wait(500);
  throw Error('bar');
}

async function foo() {
//  await wait(500);
  throw {"aError":"aError"}
}

foo()
.then(function(r,j){ 
    console.info(r,j);
})
.catch(function(e){
    console.info(e); 
});