[자바스크립트] 프로미스 올

다거부하든지 다리졸브한다.

 

const promise1 = Promise.resolve(3);
const promise2 = 42;
const promise3 = new Promise((resolve, reject) => {
    setTimeout(resolve, 1000, 'foo');
});

Promise.all([promise1, promise2, promise3]).then((values) => {
    console.log(values);
});
// Expected output: Array [3, 42, "foo"]

 

all settled의 사용

 

Promise.allSettled([
    Promise.resolve(33),
    new Promise(resolve => setTimeout(() => resolve(66), 0)),
    99,
    Promise.reject(new Error('an error'))
])
    .then(values => console.log(values));

// [
//   {status: "fulfilled", value: 33},
//   {status: "fulfilled", value: 66},
//   {status: "fulfilled", value: 99},
//   {status: "rejected",  reason: Error: an error}
// ]

async function run() {
    const values = await Promise.allSettled([
        Promise.resolve(33),
        new Promise(resolve => setTimeout(() => resolve(66), 0)),
        99,
        Promise.reject(new Error('an error'))
    ])
    console.log(values)
    // [
    //   {status: "fulfilled", value: 33},
    //   {status: "fulfilled", value: 66},
    //   {status: "fulfilled", value: 99},
    //   {status: "rejected",  reason: Error: an error}
    // ]
}

run();