[React] Creating a Stateless Functional Component
Most of the components that you write will be stateless, meaning that they take in props and return what you want to be displayed. In React 0.14, a simpler syntax for writing these kinds of components was introduced, and we began calling these components "stateless functional components". In this lesson, let's take a look at how to define a stateless function component, and how to integrate useful React features like Prop Type validation while using this new component syntax.
Compnents with State:
class Title extends React.Component {
render(){
return (
<h1>{this.props.value}</h1>
)
}
}
class App extends React.Component {
render(){
return (
<Title value="Hello World!" />
)
}
}
ReactDOM.render(
<App />,
document.querySelector("#root")
)
Conver Title component to stateless component:
const Title = (props) => (
<h1>{props.value}</h1>
) class App extends React.Component {
render(){
return (
<Title value="Hello World!" />
)
}
} ReactDOM.render(
<App />,
document.querySelector("#root")
)
So now you cannot access lifecycle hooks, anyway a dump compoennt doesn't need to handle those lifecycle hooks.
But if you want to set defaultProps and propTypes, it is still possible:
/*class Title extends React.Component {
render(){
return (
<h1>{this.props.value}</h1>
)
}
}
*/
const Title = (props) => (
<h1>{props.value}</h1>
)
Title.propTypes = {
value: React.PropTypes.string.isRequired
}
Title.defaultProps = {
value: "Egghead.io is Awson!!"
}
class App extends React.Component {
render(){
return (
<Title value="Hello World!" />
)
}
}
ReactDOM.render(
<App />,
document.querySelector("#root")
)
Statless compoennt rendering much fast than extends one.
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