React Component Vs Purecomponent

PureComponent is an advanced optimisation technique. It is very important for a React developer to know when to use a Component PureComponent and a Stateless Functional Component in your code.

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Advanced because it can also break your app if you are not careful.

React component vs purecomponent. Early on React developers had the idea of pure components. On the other hand React pure component does implement shouldComponentUpdate by default and by performing a shallow comparison on React state and props values. React has now provided us a PureComponent which does the comparison of state and props to decide the update cycle.

The major difference between ReactPureComponent and ReactComponent is PureComponent does a shallow comparison on state change. To use PureComponent simply derive your class-based component from ReactPureComponent instead of ReactComponent. These components still used the ReactComponent class but the idea provided a useful mental model for developers to work with.

This concept went by a variety of names statefulpure smartdumb containerpresentational etc but were all fairly similar. Pure components are written pretty much the same way as class components with a minor tweak. The base component does that for you out-of-the-box.

This tutorial details the difference between Component and PureComponent. ReactPureComponent không cho phép dev override lại shouldComponentUpdate hook nếu bạn cố tình override thì bạn sẽ ăn ngay warning. Optimisation because it has a potential to make your application faster.

When props or state changes PureComponent will do a shallow comparison on both props and state. Its important to notice that the pure component in the third example. Generally we use state or props value to decide the update cycle.

If your React components render function renders the same result given the same props and state you can use ReactPureComponent for a performance boost in some cases. The biggest difference between React pure component vs a regular React component is that a React component doesnt implement shouldComponentUpdate by default. Component and PureComponent have one difference.

Component vs PureComponent vs Stateless Functional. The difference between them is that ReactComponent doesnt implement shouldComponentUpdate but ReactPureComponent implements it with a shallow prop and state comparison. Class components that extend the ReactPureComponent class are treated as pure components.

Now the Pure Component doesnt re-render because of the props and state in it actually we dont have any dont change but the Component and the Functional Component re-renders whenever the parent component re-renders. There is this main advantage of using ReactPureComponent over ReactComponent. Advantage of using ReactPureComponent.

Import React PureComponent from react class App extends PureComponent render return export default App. RegularWithLabel - React Component which uses the label property Regular ReactComponent is re-rendered each time it receives new properties even if they are equal to old. For class components like this React provides the PureComponent base class.

PureComponent is exactly the same as Component except that it handles the shouldComponentUpdate method for you. It means that when comparing scalar values it compares their values but when comparing objects it compares only references. A React component is considered pure if it renders the same output for the same state and props.

ReactComponent cho phép dev override lại shouldComponentUpdate hook mặc định hook này reference compare để quyết định re-render lại hay không. The code used during the demo as well as a detailed README containing more info on. First things first.

It helps to improve the performance of the app. The purpose of the shouldComponentUpdate is we can custom implement the default behavior and decide when react should update or re-render the component. If you run the React App you will see the values updating in the Child Components except for the Pure Component.

On the other hand ReactPureComponent is re-rendered only if new properties are different from the old ones. Meaning when you create a component by extending ReactPureComponent you need to implement it explicitly. Reactmemo does the same as PureComponent but it does not check for changes in state only in props.

And that is as it shallowly compares props and state the. React 的 PureComponent Vs Component 一它们几乎完全相同但是PureComponent通过prop和state的浅比较来实现shouldComponentUpdate某些情况下可以用PureComponent提升性能 1所谓浅比较 shallowEqual即react源码中的一个函数然后根据下面的方法进行是不是 PureComponent 的判断帮我们做了本来应该我们在 shouldComponentUpdate 中做的事情.

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