class equivalent in react code example

Example 1: create react component class

class MyComponent extends React.Component{
    constructor(props){
        super(props);
    };
    render(){
        return(
            <div>
              <h1>
              	My First React Component!
              </h1>
            </div>
        );
    }
};

Example 2: ng-class equivalent in react

<div className={this.props.canChange ? "change-button" : "change-button gray-out"}>
blah
</div>