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Promises in Node.js represent the eventual completion or failure of an asynchronous operation and its resulting value. They are an alternative to callback functions for asynchronous code execution. A promise in Node.js is an object that may produce a single value in the future: either a resolved value or a reason that it's not resolved (e.g., a network error occurred).
Code Example
Here's a basic example of creating a promise in Node.js:
let promise = new Promise(function(resolve, reject) {// "Producing Code" (May take some time)let isSuccessful = true; // just for demonstrationif (isSuccessful) {resolve('The operation was successful.');} else {reject('The operation failed.');}});// "Consuming Code" (Must wait for a fulfilled Promise)promise.then(function(value) { console.log(value); }, // code if successfulfunction(error) { console.log(error); } // code if some error);Explanation and Discussion
Promises have three states:
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