# React state
// React Component First Letter Capital class based or function based
// maximum 80 character in one line
// make more readable
// space with 2 indent
// one function one work, to create accuracy
// Event => event function
// alway give Naming: (function name)Handler, (function name)Handle, (function name)Event
// setState is a Setter function
```javascript=
class Sum extends React.Component {
constructor(props) {
super(props);
this.state = {
firstValue: '',
work: ''
}
this.myDivHandler = this.myDivHandler.bind(this);
}
myDivHandler(event) {
// code
this.setState({
firstValue: event.target.value
})
}
render() {
return (
<div className="my-div" id="myDiv">
<input onChange={this.myDivHandler} value={this.state.firstValue} />
Simple Div
{this.state.firstValue}
{/* {getter method} */}
{console.log('asss')}
{this.props.fruit}
</div>
);
}
}
ReactDOM.render(<Sum fruit="Apple" />, document.getElementById("#mount"));
```