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ReactDOM.render()'s first argument should evaluate to a JSX expression, it doesn't have to literally be a JSX expression.

The first argument could also be a variable, so long as that variable evaluates to a JSX expression.

In this example, we save a JSX expression as a variable named toDoList. We then pass toDoList as the first argument to ReactDOM.render():

const toDoList = ( <ol> <li>Learn React</li> <li>Become a Developer</li> </ol> ); ReactDOM.render( toDoList, document.getElementById('app') );
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