JavaScript promises helps us to handle asynchronous operations more efficiently by assigning the handler with the success value or failure reason.

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JS promises

promises

Promises are used to deal with event handling and callbacks in asynchronous programming in JavaScript, such as clicks and key presses. Promises allow developers to specify a function to execute at some later point in response to certain events. Promises may also indicate whether a certain code succeeded or failed in performing its assigned job.

In this course, you will learn how to chain different promises, which makes the code easier to understand and debug. Next, you’ll learn built-in methods to monitor and respond to multiple promises executing in parallel. Then, you will cover async functions and await expressions that are often used with promises. Finally, you’ll learn how to track promises when they are rejected without a rejection handler.

Promises are important to understand and debug the code in asynchronous programming. The concepts of JS promises help developers working with Node.js and Deno for event handling and with asynchronous JavaScript APIs.

JavaScript Promises

## Introduction
One of the most powerful aspects of JavaScript is how easily it handles asynchronous programming. As a language created for the web, JavaScript needed to respond to user interactions, such as clicks and key presses, from the beginning, so event handlers such as `onclick` were created.

**Event handlers** allow developers to specify a function to execute at some later point in time in reaction to an event.

Node.js further popularized asynchronous programming in JavaScript by using callback functions in addition to events. 
As more and more programs started using asynchronous programming, events and callbacks were no longer sufficient to support everything developers wanted to do. Promises are the solution to this problem. 

## Promises 


A **promise** specifies some code to be executed later (as with events and callbacks) and explicitly indicates whether the code succeeded or failed at its job. We can chain promises based on success or failure, in ways that make our code easier to understand and debug. Promises work like future and deferred in other languages. 

# Introduction
One of the most powerful aspects of JavaScript is how easily it handles asynchronous programming. As a language created for the web, JavaScript needed to respond to user interactions, such as clicks and key presses, from the beginning, so event handlers such as `onclick` were created.

**Event handlers** allow developers to specify a function to execute at some later point in time in reaction to an event.

Node.js further popularized asynchronous programming in JavaScript by using callback functions in addition to events. 
As more and more programs started using asynchronous programming, events and callbacks were no longer sufficient to support everything developers wanted to do. Promises are the solution to this problem. 

# Promises 

Introduction

Basics of Promises

Chaining Promises

Working with Multiple Promises

Async Functions and Await Expressions

Tracking Down the Unhandled Rejections

Conclusion

Introduction to JavaScript Promises

Introduction

Promises