React 18 Roll Out – Know the key features to be expected

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React 18 Roll Out – Know the key features to be expected

React 18 has been recently launched on its official website in the form of react native latest version. It will be available only in alpha. However, no specific release date has been announced yet but experts are analyzing predictions. Most of the developers were waiting to unlock the React 18 features to get insight into this new version.

ReactJS, designed by Facebook, is popular in the market and is referred to as an open-source library that runs on JavaScript. Even for startups and business leaders. The simplicity and flexibility of React connect it well with users. PayPal, Instagram and Uber use react to solve their user interface problem.

Most of the developers like to use React 18 to craft UI rich web apps that are highly efficient and fast. No matter whether it is a start-up or a big enterprise, React JS is useful everywhere. Furthermore, it requires less coding effort which makes it best suited among the developers.

The reason behind the popularity of React

There are several reasons behind React popularity such as the component-based nature of the virtual Document Object Model and data binding. Moreover, its open-source nature makes it more popular among professionals in mobile app development.

For React developers, the react 18 new features will be quite helpful to improve some of the areas. Here in this article, we will cover all such ReactJS latest version updates.

React 18 Features- Latest additions and changes to be expected

Selective Hydration and New suspense SSR

The Server-side rendering that is also known as SSR is a component that generates HTML from the React components. Through SSR, users can easily preview the page even prior to JavaScript bundle present loads and runs. However, there is a long time taken to get loaded and processed by the JavaScript on the backend side which is addressed as Hydrating Time. In React 18, there will be an architectural improvement to the React SSR’s performance. With this new update, there will be direct streaming of the HTML on the server.

The components that are wrapped with suspense will not block hydration anymore with the use of the Selective hydration method. Once the browser gets JavaScript code and content, the ready component will start hydrating well.


Transition API is an ultimate feature of React 18. Through this, users can easily solve the frequent updates issues. With the help of startTransition API developers can easily identify which action may block the thread.

Here you can update the input value and search result well. setSearchQuery(input);

If more urgent updates like key presses come, the updates wrapped in start Transition will be marked as non-urgent.

React will throw the stale rendering work in case the transition gets interrupted by the user. We update the input value and use a new value to find the list.

Start Transition for Concurrent Rendering

start Transition will be the new API introduced in React 18 that will keep the application responsive. This will be very useful for mobile app developers. Even during the large screen updates, the app will be the same and respond well. Sometimes, the page freezes when small actions are performed during the user interface such as typing an input or clicking a button. Like this, it will be easy to detect which update is crucial and which one is not. The start Transition will move the update to the background. This consists of either slowed data fetching or complex processing.

Automatic Batching

When the React Multiple state groups update into one render for improving performance then the process is called batching.

In case if you have two state updates inside the same click event, the react has always batched these into one re-render. This will eliminate the rendering of components “Half-Finished”. The new updates in the React 18 will improve the update. With this update, there will be automation in the batch update. The batching process will be more consistent and efficient as well.

function App() {
const [count, setCount] = useState(0);
const [flag, setFlag] = useState(false);
function handleClick() {
fetchSomething().then(() => {
// React 18 and later DOES batch these:
setCount(c => c + 1);
setFlag(f => !f);
// React will only re-render once at the end (that’s batching!)

return (



It is no matter where the states originate, it will always re-rendered once in the automatic batching.

Easy Update

It is easy to upgrade to the React 18 version easily because the concurrency in React 18 is subjective. Users will be able to convert many applications to React 18. By deploying several concurrent feature components at Facebook the company has tested it well.

Improvement to the Root API

Root API is defined as a pointer for top-level data structures in React. This is used for tracking a render tree. When using the new React 18 version, two different root APIs will be deployed well. These root APIs are legacy root API and ReactDOM.createRoot in which legacy root API will run a legacy mode root API. If this API is deprecated it will trigger the warnings. On the other hand, the ReactDOM.createRoot will integrate all the improvements to the app.

Old root API

import React from ‘react’;
import ReactDOM from ‘react-dom’;
import App from ‘App’;
ReactDOM.render(, document.getElementById(‘root’));

New root API:

import ReactDOM from ‘react-dom’;
import App from ‘App’;
const root = ReactDOM.createRoot(document.getElementById(‘root’));

Removing the hydrate method will be the biggest change of the new root API.

Strict Effects

Along with Strict Effects Mode, the React18 will now ship . Likewise Strict Mode will be useful for improved DX and development builds. React will detect unusual behaviour by running the side effect twice. This running effect twice is like mount-> unmounts -> mount.

Wrapping up

It would be not wrong to expect that the new React 18 update will be impactful in the positive direction. It has opened up those possibilities that were impossible in the JavaScript framework. React 18 has been professionally made and looks in line with the best practices that could be profitable to the individual. If you are about to hire a React JS developer then you should discuss these points to know whether the professional is well aware or not.

By | 2021-09-28T11:27:15+00:00 September 28th, 2021|Mobile Apps, React Native App|0 Comments