callbacks

JavaScript, by default, is synchronous and single-threaded, meaning that code cannot create new threads and run in parallel. However, asynchronous programming allows code to run independently of the main program flow. In this blog, we will explore the concept of asynchronous code and its implementation in JavaScript, specifically through the use of callbacks. We will also discuss the challenges associated with callbacks and alternative approaches to handle asynchronous code. Asynchronicity in Programming Languages Computers are inherently asynchronous....

Learn how to retrieve the result of an asynchronous function, whether it is promise-based or callback-based, using JavaScript. Imagine you encounter this scenario: you need to return the result of an asynchronous call from the original function. Here is a simplified example: const mainFunction = () => { const result = asynchronousFunction(); return result; } However, asynchronousFunction() performs an asynchronous operation, such as a fetch() call, and cannot directly return the result value....

The Event Loop is a fundamental concept to understand in Node.js. It explains how Node can be asynchronous and have non-blocking I/O, which is what makes it so successful. Node.js code runs on a single thread, meaning that only one thing can happen at a time. While this may seem like a limitation, it simplifies programming by eliminating the need to worry about concurrency issues. However, it is important to be mindful of how you write your code to avoid blocking the thread....