What the heck is React DOM?

In the previous story i talked about component instantiation. We know that the App component’s instantiation has been in our application from the start, in the src/index.js file:

Next to React which is imported from react, there is another imported library called react-dom, in which a ReactDOM.render() function uses an HTML node to replace it with JSX.

Essentially that’s everything needed to integrate React into any application which uses HTML.

In more detail, ReactDOM.render() expects two arguments; the first is to render the JSX.

It creates an instance of your App component, though it can also pass simple JSX without any component instantiation:

The second argument specifies where the React application enters your HTML. It expects an element with an id=’root’, found in the public/index.html file. This is a basic HTML file.

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