computer science

React Native

React Native is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand React Native rather than just read about it. In short: React Native is an open-source UI software framework developed by Meta Platforms (formerly Facebook Inc.). It is used to develop applications for Android, Android TV, iOS, macOS, tvOS, Vega OS, Web, Windows and UWP by enabling developers to use the React framework along with native platform capabilities.

React Native — illustration

Key takeaways

React Native belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect React Native to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of React Native from memory before moving on to harder problems.

Reference excerpt

React Native is an open-source UI software framework developed by Meta Platforms (formerly Facebook Inc.). It is used to develop applications for Android, Android TV, iOS, macOS, tvOS, Vega OS, Web, Windows and UWP by enabling developers to use the React framework along with native platform capabilities. It is used to develop Android and iOS applications at Facebook, Microsoft, and Shopify. It is also being used to develop virtual reality applications at Oculus.

History In 2012 Mark Zuckerberg commented, "The biggest mistake we made as a company was betting too much on HTML5 as opposed to native". Using HTML5 for Facebook's mobile version resulted in an unstable application that retrieved data slowly. He promised Facebook would soon deliver a better mobile experience. Inside Facebook, Jordan Walke developed software that generated UI elements for iOS from a background JavaScript thread, which became the basis for the React web framework. They decided to organize an internal hackathon to perfect this prototype in order to be able to build native apps with this technology. In 2015, after months of development, Facebook released the first version for the React JavaScript Configuration. During a technical talk, Christopher Chedeau explained that Facebook was already using React Native in production for its Group App and its Ads Manager App. In October 2025, Meta announced that it would donate React, React Native, and JSX (JavaScript XML) to a new React Foundation, part of the Linux Foundation.

Implementation The working principles of React Native are virtually identical to React except that React Native does not manipulate the DOM via the Virtual DOM. It runs in a background process (which interprets the JavaScript written by the developers) directly on the end-device and communicates with the native platform via serialized data over an asynchronous and batched bridge. React components wrap existing native code and interact with native APIs via React's declarative UI paradigm and JavaScript. TypeScript is often used over JavaScript in modern React Native applications due to its increased type safety. While React Native styling has a similar syntax to CSS, it does not use HTML or CSS. Instead, messages from the JavaScript thread are used to manipulate native views. Using plugins, Tailwind can also be used with React Native. React Native is also available for both Windows and macOS, which is currently maintained by Microsoft.

"Hello, World!" example A "Hello, World!" program in React Native looks like this:

TypeScript example In TypeScript, a counter component looks like this:

Illustrations

Worked examples

Example 1 — a first encounter with React Native

Start with the simplest possible case. Write down what React Native claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to React Native before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about React Native ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of React Native

In research: React Native appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses React Native in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: React Native is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cross-platform software, Facebook software, Mobile software development, so understanding it makes those chapters shorter.
In everyday life: Look for React Native outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study React Native in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what React Native means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain React Native out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is React Native in simple terms?

Why does React Native matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study React Native?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on React Native.