Sebastian MarkbågeandGitHub
b18a171a61
* Add a bunch of optimizations to SuspenseList We now are able to bail out of reconciliation and splitting out the tail during deep updates that hasn't changed the child props. This only works while the list wasn't suspended before. I also moved the second render of the "head" to the complete phase. This cleans it up a bit for the tail collapsing PR. For this second pass I also use a new technique of resetting the child Fibers for the second pass. This is effectively a fast path to avoid reconciling the children against props again. * Move to didSuspend from SuspenseListState to the effectTag The effectTag now tracks whether the previous commit was suspended. This frees up SuspenseListState to be render-phase only state. We use null to mean the default "independent" mode. * Rename to SuspenseListState to SuspenseListRenderState * Reuse SuspenseListRenderState across render passes * Add optimization to bail out of scanning children if they can't be suspended This optimized the deep update case or initial render without anything suspending. We have some information available to us that tell us if nothing has suspended in the past and nothing has suspended this render pass. This also fixes a bug where we didn't tag the previous render as having suspended boundaries if we didn't need to force a rerender. * rm printChildren oops
React · 
React is a JavaScript library for building user interfaces.
- Declarative: React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable, simpler to understand, and easier to debug.
- Component-Based: Build encapsulated components that manage their own state, then compose them to make complex UIs. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep state out of the DOM.
- Learn Once, Write Anywhere: We don't make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code. React can also render on the server using Node and power mobile apps using React Native.
Learn how to use React in your own project.
Installation
React has been designed for gradual adoption from the start, and you can use as little or as much React as you need:
- Use Online Playgrounds to get a taste of React.
- Add React to a Website as a
<script>tag in one minute. - Create a New React App if you're looking for a powerful JavaScript toolchain.
You can use React as a <script> tag from a CDN, or as a react package on npm.
Documentation
You can find the React documentation on the website.
Check out the Getting Started page for a quick overview.
The documentation is divided into several sections:
You can improve it by sending pull requests to this repository.
Examples
We have several examples on the website. Here is the first one to get you started:
function HelloMessage({ name }) {
return <div>Hello {name}</div>;
}
ReactDOM.render(
<HelloMessage name="Taylor" />,
document.getElementById('container')
);
This example will render "Hello Taylor" into a container on the page.
You'll notice that we used an HTML-like syntax; we call it JSX. JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML. If you're using React as a <script> tag, read this section on integrating JSX; otherwise, the recommended JavaScript toolchains handle it automatically.
Contributing
The main purpose of this repository is to continue to evolve React core, making it faster and easier to use. Development of React happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving React.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our contributing guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React.
Good First Issues
To help you get your feet wet and get you familiar with our contribution process, we have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started.
License
React is MIT licensed.