ES6 and beyond is very popular.
JS is also unlike any other language in that the experimentation occurs on massive scale thanks to transpilers. Never happened before. -- Dan Abramov
React is a declarative, efficient, and flexible JavaScript library for building user interfaces.
In the earlier days of React development, many programmes were written in ES5. Howerver, as ES6 and beyond is more widely accepted now and with the help of transpiler tools like Babel, we can gradually retire some ES5 code and adopt some new JavaScript features in React development.
Here is a check list to help you translate your ES5 code to ES next in React. You are welcome to contribute with more items provided below.
- require => import
- createClass => extends React.Component
- module.exports => export default
- name function() => name()
- getDefaultProps and propTypes
- getInitialState
- destructuring & spread attributes
- use arrow functions
ES5
//ES5
var React = require("react");
var PropTypes = React.PropTypes;ES6
import React, { Component, PropTypes } from 'react';ES5
var Mycomponent = React.createClass({
render: function() {
return (
<div>ES5</div>
);
},
});ES6
class Mycomponent extends React.Component {
render() {
return (
<div>ES6</div>
);
}
}ES5
var Mycomponent = React.createClass({
render: function() {
return (
<div>ES5</div>
);
},
});
module.exports = Mycomponent;ES6
export default class Mycomponent extends React.Component {
render() {
return (
<div>ES6</div>
);
}
}ES5
var Mycomponent = React.createClass({
componentWillMount: function(){
},
render: function() {
return (
<div>ES5</div>
);
},
});
module.exports = Mycomponent;ES6
export default class Mycomponent extends React.Component {
componentWillMount() {
}
render() {
return (
<div>ES6</div>
);
}
}ES5
var Video = React.createClass({
getDefaultProps: function() {
return {
autoPlay: false,
maxLoops: 10,
};
},
propTypes: {
autoPlay: React.PropTypes.bool.isRequired,
maxLoops: React.PropTypes.number.isRequired,
posterFrameSrc: React.PropTypes.string.isRequired,
videoSrc: React.PropTypes.string.isRequired,
},
render: function() {
return (
<View />
);
},
});ES6
class Video extends React.Component {
render() {
return (
<View />
);
}
}
Video.defaultProps = {
autoPlay: false,
maxLoops: 10,
};
Video.propTypes = {
autoPlay: React.PropTypes.bool.isRequired,
maxLoops: React.PropTypes.number.isRequired,
posterFrameSrc: React.PropTypes.string.isRequired,
videoSrc: React.PropTypes.string.isRequired,
};ES future proposals:
class Video extends React.Component {
static defaultProps = {
autoPlay: false,
maxLoops: 10,
}
static propTypes = {
autoPlay: React.PropTypes.bool.isRequired,
maxLoops: React.PropTypes.number.isRequired,
posterFrameSrc: React.PropTypes.string.isRequired,
videoSrc: React.PropTypes.string.isRequired,
}
state = {
loopsRemaining: this.props.maxLoops,
}
}ES5
var Header = React.createClass({
getInitialState: function() {
return {
title: this.props.title
};
},
});ES6
export default class Header extends Component {
constructor(props) {
super(props);
this.state = {
title: props.title
};
}
}ES future proposals:
export default class Header extends Component {
state = {
title: this.props.title
};
// followed by constructor...
}class AutoloadingPostsGrid extends React.Component {
render() {
var {
className,
...others, // contains all properties of this.props except for className
} = this.props;
return (
<div className={className}>
<PostsGrid {...others} />
<button onClick={this.handleLoadMoreClick}>Load more</button>
</div>
);
}
}Stateless component:
function App() {
return (
<div>
<MyComponent />
</div>
);
}Using Arrow function:
const App = () => (
<div>
<MyComponent />
</div>
);Using Arrow funtion with Destructuring function arguments:
const App = ({className, ...rest}) => (
<div className={classnames(className)} {...rest}>
<MyComponent />
</div>
);- React
- Babel
- ECMAScript 6 support in Mozilla
- React on ES6+
- Converting React project from ES5 to ES6
- React/React Native 的ES5 ES6写法对照表
- Include all ES5 to ES6+ instructions for React
- We may Implement ESlint plugin like ESlint-Plugin-React-5-to-6
- We may Include instructions for configuring Babel with different stages
MIT