React.js version 17 was released in October 2020 and introduced several new features and improvements. In this blog post, we’ll explore the major updates in React.js version 17.
No More Event Pooling
One of the most significant changes in React.js version 17 is the removal of the event pooling optimization. Previously, React.js used a technique called “event pooling” to reduce the number of event objects created by the browser. However, this technique had some drawbacks, such as preventing the use of asynchronous event handlers and making the code more difficult to reason about.
With React.js version 17, the event pooling optimization has been removed, and every event object is now a unique instance. This change allows developers to use asynchronous event handlers and makes it easier to reason about the behavior of event handling in React.js.
I imported my AnalogDisplay component (original in React) into preact JSFiddle code, and they worked well. I can either use this.state or just state in render(). Here’s the JSFiddle code: http://jsfiddle.net/gz7L59mn/1/ and the source code:
This project will guide you through building an autocomplete function similar to the one that you might see in Slack (a popular messaging app), as shown in figure 1, when you type something in the search box. For simplicity, our widget will work with room names (the rooms in a chat application).
The autocomplete widget will have (figure 2):
An input field
A list of options filtered according to the entered characters
An Add button (figure 3)
The filtering of the matches will be done using the entered characters as the first characters of the option. In other words, there is a simple comparison that allows us to autocomplete the name of the room (figure X). For example, if you type “mac” and you have “Mac OS X” and “Apple Mac,” then only “Mac OS X” will be shown as a match, not both options.
In this book, I’ll introduce you to React Native for native mobile iOS and Android development… and do it quickly. We’ll cover topics such as
Why React Native is Awesome
Setting up React Native Development for iOS
Hello World and the React Native CLI
Styles and Flexbox
Main React Native UI components
Importing Modules into an Xcode Project
Project: Weather App
This book is about getting started with React quickly and not about React Native, which is technically a separate library (or some might even call it a framework). But I figured after eight chapters of working with React for web development, it would be fun to apply our knowledge to mobile development by leveraging this awesome library. You’ll be amazed how many React Native skills you already know from React.
This post has been written by Scott Hasbrouck. You can find him on Twitter or his website.
The project for this article will be minimal. The idea is to have a dynamically generated menu which will consist of <a> tags.
We’ll use custom React components Menu and Link. They way we create them is similar to the way we create the HelloWorld component in the previous example. The project will show you how to render nested elements programmatically. In the previous examples, we just coded the children manually. We’ll use the map() function for it.
Also, you can download the entire first chapter for FREE at Manning. The book is scheduled for release in the first quarter of 2016, but early access (e-copy) is available right now. Use code “mardandz” to get 39% off at Manning.
Also, React is very fast due to its virtual DOM and smart diffing algorithm. And React’s component approach to architecture allows for great development scalability. Just ask Facebook, Twitter, Slack and other companies with large web apps.
Hey, you can even use live reloading when developing apps with React Native. Pure joy! The feature native mobile developers can only dream of! “React is fun, but show me the money”— you can yell. Fair enough.
Last week, I attended the HTML5Dev conference in San Francisco which was just across from Capital One SF office at 201 3rd St. The conference was split across a few building which made it hard to navigate and find talks.
The whole conference was along the lines of React is amazing, ES6 is the future and Node.js is everywhere. There were a few talks on the Internet of Things, design, UX and HTTP/2 as well. Here’s the recap of the talks to which I went to.