Promises

In JavaScript, promises are a way to handle asynchronous operations. They provide a cleaner and more readable way to manage async code compared to traditional callback functions.

A promise is an object that represents the eventual completion (or failure) of an asynchronous operation and its resulting value.

To create a promise, we use the Promise constructor and pass a function as an argument. This function takes two parameters: resolve and reject.

Here's an example of creating and using a promise:

1function getData() {
2  return new Promise((resolve, reject) => {
3    setTimeout(() => {
4      const data = [1, 2, 3, 4, 5];
5      resolve(data);
6    }, 2000);
7  });
8}
9
10getData()
11  .then(data => {
12    console.log('Received data:', data);
13  })
14  .catch(error => {
15    console.log('Error occurred:', error);
16  });

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// Promises example

​

function getData() {

  return new Promise((resolve, reject) => {

    setTimeout(() => {

      const data = [1, 2, 3, 4, 5];

      resolve(data);

    }, 2000);

  });

}

​

getData()

  .then(data => {

    console.log('Received data:', data);

  })

  .catch(error => {

    console.log('Error occurred:', error);

  });