#348 Promise Resolution Order

easy
javascript
promises

What will be the order of following code:

new Promise((resolve, reject) => {
  resolve(1);
  resolve(2);
  reject("error");
}).then(
  (value) => {
    console.log(value);
  },
  (error) => {
    console.log("error");
  },
);

The code will output:

1

This is because:

  1. In a Promise, only the first resolve() or reject() call takes effect
  2. Once a Promise is settled (either resolved or rejected), it cannot change its state
  3. In this case, resolve(1) is called first, so the subsequent resolve(2) and reject('error') are ignored
  4. The .then() handler receives the value from the first resolve(1) call and logs it