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Home Forums How to create a new Promise in JavaScript? Give an example. – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 26 Sep 2023
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Creating a new Promise in JavaScript involves using the Promise constructor. Here's an example of how to create a new Promise:

const myPromise = new Promise((resolve, reject) => {
  // Inside this function, you define the asynchronous operation
  // For example, you can simulate an async operation with setTimeout

  setTimeout(() => {
    const success = true; // Replace with your actual logic
    if (success) {
      resolve("Operation succeeded!"); // Resolve the promise with a value
    } else {
      reject("Operation failed!"); // Reject the promise with an error
    }
  }, 2000); // Simulating a delay of 2 seconds
});

// Using the promise
myPromise
  .then((result) => {
    console.log("Success:", result);
  })
  .catch((error) => {
    console.error("Error:", error);
  });

In this example, we create a new Promise called myPromise. It takes a function as its argument, which receives two parameters: resolve and reject. Inside this function, you define your asynchronous operation, which in this case is simulated using setTimeout.

If the operation is successful, you call resolve and pass the result to it. If it encounters an error, you call reject and provide an error message or an error object.

You can then use the .then() method to handle the successful outcome when the Promise is resolved and the .catch() method to handle errors when the Promise is rejected.

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