Update React guide in code style
This updates React guidance to prefer JS classes and adds additional info about how to handle specific situations when using them. Signed-off-by: J. Ryan Stinnett <jryans@gmail.com>
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@ -165,7 +165,6 @@ ECMAScript
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React
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-----
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- Use React.createClass rather than ES6 classes for components, as the boilerplate is way too heavy on ES6 currently. ES7 might improve it.
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- Pull out functions in props to the class, generally as specific event handlers:
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```jsx
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@ -175,10 +174,37 @@ React
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<Foo onClick={this.onFooClick}> // Best, if onFooClick would do anything other than directly calling doStuff
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```
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Not doing so is acceptable in a single case; in function-refs:
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Not doing so is acceptable in a single case: in function-refs:
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```jsx
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<Foo ref={(self) => this.component = self}>
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```
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- Prefer classes that extend `React.Component` (or `React.PureComponent`) instead of `React.createClass`
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- You can avoid the need to bind handler functions by using [property initializers](https://reactjs.org/docs/react-component.html#constructor):
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```js
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class Widget extends React.Component
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onFooClick = () => {
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...
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}
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}
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```
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- To define `propTypes`, use a static property:
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```js
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class Widget extends React.Component
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static propTypes = {
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...
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}
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}
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```
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- If you need to specify initial component state, [assign it](https://reactjs.org/docs/react-component.html#constructor) to `this.state` in the constructor:
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```js
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constructor(props) {
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super(props);
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// Don't call this.setState() here!
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this.state = { counter: 0 };
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}
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```
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- Think about whether your component really needs state: are you duplicating
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information in component state that could be derived from the model?
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