Promises are one way to deal with asynchronous code in JavaScript, without writing too many callbacks in your code.Introduction to promises How promises work, in brief Which JS API use promises? Creating a pro
In this guide, we’re going to talk about what promises are and how they work. We’ll walk through an example of a promise to help you learn how to use them in your code. Let’s get started! What is a Promise? A promise is an object that returns a response that you want to re...
When it comes to Node.js, it has to do more because node promises more. In case of browser, we are limited to what we can do in the background. But in node, we can pretty much do most of the things in background, even it is simple JavaScript program. But, how does that work?
Async/await is a new way of writing asynchronous code in JavaScript. Before this, we used callbacks and promises for asynchronous code. It allows us to write a synchronous-looking code that is easier to maintain and understand.Async/await is non-blocking, built on top of promises, and can'...
Now, JavaScript has its own built-in way to make API requests. This is the Fetch API, a new standard to make server requests with Promises, but which also includes additional features. Promises section Step 1 — Getting Started with Fetch API Syntax ...
Say you need to fire up 2 or more promises and wait for their result. How to do that?Say you need to fire up 2 or more promises and wait for their result.And you want to go on, once you have both resolved.How can you do so, in JavaScript?
Introduced in ES11, you can use the Promise.allSettled() method, which waits for all promises to settle — i.e. it waits till all the given promises are either fulfilled or rejected. Upon completion, it returns a single Pr
In myprevious post, I took you through an introduction and gave a peek under the hood forES6Promises, showing you how they work and how to use them. Today, I’m going to talk about how JavaScriptPromises can break. Hopefully, this will equip you to track downPromisebugs in code that ...
A mutex or semaphore can be used to allow for deterministic memory access but they can be complicated to get right. Javascript does support an Atomics API but it uses promises which are gross. Eww sick. For now, I am going to do everything in my power to avoid a case where two thread...
However, there are other ways to run background tasks in Node.js, such as using worker threads or child processes. Can I use the Background Tasks API with Promises or async/await? The Background Tasks API does not return a Promise, so it can’t be used directly with async/await. ...