Top 20 React Native Component Libraries to Make Your Journey Easier in 2020

"Lifting State Up" is legitimately the answer to the state management problem in React and it's a rock solid one.

state more logically separated and located in the react tree closer to where it matters.

Sure you can hook up different reducers to manage different parts of your application, but the indirection of going through all these action creators and reducers is not optimal.

consistently see developers putting all of their state into redux. Not just global application state, but local state as well. This leads to a lot of problems

One of the reasons redux was so successful was the fact that react-redux solved the prop drilling problem. The fact that you could share data across different parts of your tree by simply passing your component into some magical connect function was wonderful.

If you have an object of properties, you can 'spread' them on to a component instead of specifying each one: <Info {...pkg}/>

Take the case of the <input> element in this component — we could add an on:input event handler that sets the value of name to event.target.value, but it's a bit... boilerplatey

It’s like skipping a level. For instance: instead of having to pass, say, a “user” to a Layout and have the Layout pass the “user” to the NavBar, you can create a NavBar (with the user already set) and pass the whole thing into Layout. This can help avoid the “prop drilling” problem where you’ve gotta thread a prop down through multiple layers.

onClick={() => setCount(1)}

One problem—not a fatal one, but still an issue with any virtual DOM—is that embedding SVGs directly into your app can be a resource hog. No matter how much you compress, no matter how logical and streamlined your components, if you need to load up hundreds of very-complex SVGs, React will need to track all of their nodes, and updating them becomes a chore.

Applications built with just React usually have a single root DOM node

Elements are what components are “made of”,

a syntax extension to JavaScript

We all are familiar; nowadays, mobile and mobile applications are more predominant than ever. This extensive popularity has been gained with the fact that smartphones have become much cheaper and faster.

I was just expressing that, even thought I like React, I dread having to still manually handle everything, instead of just using a directive, a la Vue.JS. This is what I consider boilerplate. Hence my comment on how I could leave React for Svelte just because of that. Clearly a Svelte side-by-side code comparison shows a much cleaner code for Svelte.

Man, just because it gets rid of SO MUCH boilerplate I want to switch already.It kills me everytime I work with forms in React. So much noise for such a simple task.

Note that when you use &::before with content, you need to add quotes to the value of content, otherwise the text does not get applied correctly.

useCallback returns a memoized callback.

const httpLink = new HttpLink({ uri: 'https://instagram-clone-3.herokuapp.com/v1/graphql' }); const authLink = setContext((_, { headers }) => { const token = accessToken; if (token) { return { headers: { ...headers, authorization: `Bearer ${token}` } }; } else { return { headers: { ...headers } }; } }); const client = new ApolloClient({ link: authLink.concat(httpLink), cache: new InMemoryCache() });

const Hello: React.FC<Props> = ({ who }) => (  <p>Hello, {who}</p>);

Gatsby

React Static is also a great replacement for the ever popular Create React App CLI. It provides a similar developer experience, zero-config environment, and features, but without boxing you in. If you ever need to customize your build system in React Static, there is no need to eject!

functional programming utility, and is included in Redux as a convenience. You might want to use it to apply several store enhancers in a row.

SPAs are incredibly common, popularised by client-side web frameworks like Angular, React and Vue.js.

Promises and useEffect(async () => ...) are not supported, but you can call an async function inside an effect.. That's why using async directly in the useEffect function isn't allowed.

Behind the scenes, when a Python, R or Julia engineer creates a Dash app, they are actually creating a React Single Page Application (“SPA”).

With Dash, any open-source React UI component can be pulled from npm or GitHub, stirred with water, transmogrified into a Dash component, then imported into your Dash app as a Python, R, or Julia library. C’est magnifique! 👨‍🍳 Dash makes the richness and innovation of the React frontend ecosystem available to Python, R, and Julia engineers for the first time.

React Native vs. Flutter: Performance

Taro 的组件编译后就是小程序的自定义组件，而小程序的自定义组件的初始化时是可以指定 data 来让组件拥有初始化数据的。开发者一般会在组件的 constructor 中设置一些初始化的 state，同时也可能会在 render 中处理 state 与 props 产生新的数据，在 Taro 中多出的这一次提前调用，就是为了收集组件的初始化数据，给自定义组件提前生成 data ，以保证组件初始化时能带有数据，让组件初次渲染正常。

It’s still a good idea to keep your code in three different buckets, and keep these buckets isolated from each other:Display/UI ComponentsProgram logic/business rules — the stuff that deals with the problem you’re solving for the user.Side effects (I/O, network, disk, etc.)

。如果同一个文件夹下有同名而不同作用的js文件，则通过中缀（小写）进一步区分

When a React component dispatches actions, how can another service catch the actions, accumulate and group them, then redispatch a single action?

JSX 的属性都采用双引号

扩展名：React 组件使用.jsx扩展名；文件名：文件名使用帕斯卡命名。 例如： ReservationCard.jsx。引用命名：React 组件使用帕斯卡命名，引用实例采用驼峰命名

Inputs are collected in standard React fashion with some hooks:

To do that, the react-redux library comes with 2 things: a component called Provider, and a function called connect.

useEffect serves the same purpose as componentDidMount, componentDidUpdate, and componentWillUnmount in React classes, but unified into a single API

Newer versions of TypeScript can now infer types based on your React.PropTypes (PropTypes.InferProps), but the resulting types can be difficult to use or refer to elsewhere in your code.

Every useState() call gets its own “memory cell”.

point of supporting multiple useState() calls is so that you can extract parts of stateful logic (state + effects) out of your components into custom Hooks which can also independently use local state and effects

array destructuring syntax to name useState() state variables but these names are not passed to React. Instead, in this example React treats name as “the first state variable”, surname as “the second state variable”, and so on. Their call index is what gives them a stable identity between re-renders

Gutenberg was developed on GitHub using the WordPress REST API, JavaScript, and React.

The combination of WordPress, React, Gatsby and GraphQL is just that - fun

const mapStateToProps = state => ({ todos: getVisibleTodos(state.todos, state.visibilityFilter)})const mapDispatchToProps = dispatch => ({ toggleTodo: id => dispatch(toggleTodo(id))})export default connect( mapStateToProps, mapDispatchToProps)(TodoList)

npx create-react-app my-app

Instead of allowing any and all components to fetch and manipulate data, which can make debugging pretty much suck, we want to implement a pattern that's in line with the Single Responsibility Principle, and that keeps our code DRY.

Mutations, subscriptions, timers, logging, and other side effects are not allowed inside the main body of a function component (referred to as React’s render phase). Doing so will lead to confusing bugs and inconsistencies in the UI.

What does useEffect do? By using this Hook, you tell React that your component needs to do something after render

In React class components, the render method itself shouldn’t cause side effects. It would be too early — we typically want to perform our effects after React has updated the DOM.

Custom Hooks are more of a convention than a feature. If a function’s name starts with ”use” and it calls other Hooks, we say it is a custom Hook. The useSomething naming convention is how our linter plugin is able to find bugs in the code using Hooks.

Places To Hire Top React Developers In 2020

Data fetching, setting up a subscription, and manually changing the DOM in React components are all examples of side effects

React Native vs Flutter vs Xamarin: A Comparative Guide [2020]

FieldsFor

If you need more advanced React-integration, like server rendering, redux, or react-router, see shakacode/react_on_rails, react-rails, and webpacker-react.

server-side rendering is strict about configuration, and the best way to find out what's wrong is to compare your project to an already working setup. Check out the reference implementations, bit by bit.

I love this library. Migrated from CRA to nwb. That didn't work out. Neutrino was very easy to setup with almost the exact setup I had with CRA but with far more customization. Again, thank you. Have a good day

MINIMALISTIC

Second, there are some fantastic projects out there like Create React App, preact-cli, nwb, and much more that avoid the boilerplate problem but at the expense of some other tradeoffs. Your configuration could be black-boxed and not able to be modified. They could force you to eject your configuration, making maintenance of the entire build dependency tree and configuration your responsibility again, and also preclude future configuration updates.

Here are a few common cases where you might want to try something else:

make stylable all of the visual states of your application - no clicking around required - just jump right to the state

The easy, functional-programming concept that a component can receive both functions AND data as arguments

in React, the component doesn't encapsulate completely around the lookup method. It provides a default implementation but allows its environment to override it

const setRefs = useRef(new Map()).current; const { children } = props; return ( <div> {React.Children.map(children, child => { return React.cloneElement(child, { // v not innerRef ref: node => { console.log('imHere'); return !node ? setRefs.delete(child.key) : setRefs.set(child.key, node)

// require('hammerjs') when in a browser. This is safe because Hammer is only // invoked in componentDidMount, which is not executed on the server. var Hammer = (typeof window !== 'undefined') ? require('hammerjs') : undefined

In fact, React itself now makes use of render props in its own context API

For example, if you were to add a className prop to the top or bottom <div> in the above demo, the <List> component would remove it in place of the top or bottom class. You can see this in the following example, where I’ve added the highlight class to the top two rows, but only the middle row is actually highlighted.To fix this, you’ll need to append a string to the className instead of replacing it.

here’s how you’d use React.Children.toArray() with React.cloneElement() to add top and bottom classes to the List component’s children.

React Native has also used this pattern in TouchableWithoutFeedback

A context wrapper that handles checkbox state changes. Must wrap <TriStateCheckbox /> and <Checkbox />.

It is used to expose internal data from within a render prop component for making it accessible to other components within the render prop component's composition.

However, in this case you would lose the possibility to render something in between. You are strictly coupled to the higher-order component's render method. If you need to add something in between of the currency components, you would have to do it in the higher-order component. It would be quite similar as you have done it previously by rendering the currency components straight away in the Amount component. If using a render prop component instead, you would be flexible in your composition.

For the sake of completeness, the following code demonstrates that the problem could be solved with a higher-order component (HOC) as well:

That's especially useful when combining it with React's slot pattern, which is used for passing multiple composed components to different places within a (render prop) component, but then advancing it with a render prop function to pass the state from the render prop component to the composed components.

However, again you would have to lift state up to the App component in order to pass the amount to the currency components. As you can see, the component composition on its own doesn't help us to solve the problem. That's the point where React's render props pattern comes into play which enhances React's component composition with an important ingredient: a render function.

But it's not that simple, because the currency components don't know about the amount now. You would have to lift the state from the Amount component to the App component.