Introduction to Promises in Node.js – Coding in Telugu

Promises are a way to handle asynchronous operations. They represent a future result of an operation, allowing you to handle success or failure when the operation completes.

Promise States:

• Pending: Initial state; neither fulfilled nor rejected.
• Fulfilled: The operation completed successfully.
• Rejected: The operation failed, and an error is available.

2. then() and catch() Methods:

• then(): Invoked when the Promise is fulfilled, allowing for the chaining of operations.
• catch(): Invoked when the Promise is rejected, handling errors gracefully.

3. Chaining Promises:

• Promises can be chained to sequence asynchronous operations effectively.
• Enhances code readability and simplifies error handling.

// Example: Using Promises
const fetchData = () => {
    return new Promise((resolve) => {
        setTimeout(() => {
            resolve("Data received!");
        }, 1000);
    });
};

fetchData()
    .then((result) => {
        console.log(result); // Output: Data received!
    })
    .catch((error) => {
        console.error(error);
    });

Q: What are the three states of a Promise?
A: Pending, Fulfilled, Rejected.

Q: How does then() differ from catch() in Promises?
A: then() is invoked when the Promise is fulfilled, while catch() is invoked on rejection, handling errors.

Q: Explain the concept of chaining Promises in Node.js.
A: Chaining Promises involves sequencing asynchronous operations, improving code readability and error handling.

Promises in Node.js tutorial
Promise states explained in JavaScript
Using then() and catch() in Promises
Chaining Promises in Node.js
Node.js Promise handling best practices

Sequencing asynchronous operations with Promises
Error handling with Promises in Node.js
Enhancing code readability with Promises
Mastering Promises in JavaScript
Practical guide to using Promises in Node.js

Promises in Node.js – Learn Coding in Telugu, Learn Programming in Telugu, Learn Node Js in Telugu, Learn JavaScript in Telugu