Calling resolve and reject Methods Inside a Promise | Can You Guess the Output?

Added: 2026-05-17

[00:00:00]All right, can you guess the output of this code?

[00:00:04]Drop your answer in the comments and let's see what happens here. First, we create a new promise and inside the executor function, we call resolve with first, then reject with error, then resolve again with second, three calls in a row. Then we chain a then and a catch to handle the result. Keep in mind that a promise is a one-way door. The moment you call resolve or reject, the promise is settled and its state is permanently locked. It can never be changed again. So, the first resolve with first settles the promise immediately. The reject and the second resolve that come after it are completely ignored by JavaScript. As a result, the output is first. If you want to master JavaScript concepts like this easily, my ebook is linked in bio.