What are Promises and async/await in JavaScript?

Quality Thought is the best full stack Python training institute in Hyderabad, offering comprehensive training programs for aspiring developers. Known for its industry-focused curriculum and hands-on approach, Quality Thought equips students with the skills required to excel in both front-end and back-end development using Python. The institute provides in-depth knowledge of essential full stack Python tools like Flask, Django, JavaScript, HTML/CSS, and React for front-end development. Additionally, students are trained in working with databases such as MySQL and MongoDB and version control tools like Git. The courses are designed by industry experts to ensure practical learning, focusing on building real-world projects that help students understand the complete development cycle. With expert instructors, a dynamic learning environment, and a strong focus on practical skills, Quality Thought remains the top choice for full stack Python training in Hyderabad.

If you’re looking for expert guidance and practical learning, Quality Thought is the ideal choice to build a successful career in full stack python. When evaluating a full stack python tool, there are several essential features to consider to ensure it meets your needs effectively.

In JavaScript, Promises and async/await are tools for handling asynchronous operations, such as fetching data from a server or reading files.

Promises:

A Promise represents a value that may be available now, in the future, or never. It has three states:

  1. Pending – operation is still in progress

  2. Fulfilled – operation completed successfully

  3. Rejected – operation failed

You handle the result using .then() and .catch():

async/await:

async/await is syntactic sugar built on Promises that makes asynchronous code look more like synchronous code, improving readability and maintainability.

  • An async function always returns a Promise.

  • Use await inside an async function to pause execution until the Promise resolves or rejects.

Summary:

  • Promises give you more control over async behavior with .then() and .catch().

  • async/await simplifies that control, making code easier to write and understand.

  • Both help prevent "callback hell" and improve asynchronous code handling in JavaScript.

Read More

What is the use of AJAX?

Explain event bubbling in JavaScript.

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