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In the previous example, Student does not need to know how the Person class’s walk() method is implemented, but still can use that method; the Student class doesn’t need to explicitly define that method unless we want to change it. This is called encapsulation

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A class component needs to include a render method. Other methods are optional. ReactDOM.render() renders the App component in a div element using the id 'root'. This takes the component and the parent div as the first and second parameter respectively.

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Yes, a class component must include a render method. All the other methods are optional.

ReactDOM.render() is rendering the App component in a div element with the id ‘root’. It takes the component as the first parameter and parent div as the second parameter.

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The original program code, graphics and sound data need to be present so that the game can be emulated. In most arcade machines, the data is stored in read-only memory chips (ROMs)