functional component how to add to existing array react

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Paula
10 Jan 2021
1const {useState, useCallback} = React;
2function Example() {
3    const [theArray, setTheArray] = useState([]);
4    const addEntryClick = () => {
5        setTheArray([...theArray, `Entry ${theArray.length}`]);
6    };
7    return [
8        <input type="button" onClick={addEntryClick} value="Add" />,
9        <div>{theArray.map(entry =>
10          <div>{entry}</div>
11        )}
12        </div>
13    ];
14}
15
16ReactDOM.render(
17    <Example />,
18    document.getElementById("root")
19);
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