react spread operator state array push usestate code example

Example 1: usestate array push

setTheArray([...theArray, newElement]);

Example 2: functional component how to add to existing array react

const {useState, useCallback} = React;
function Example() {
    const [theArray, setTheArray] = useState([]);
    const addEntryClick = () => {
        setTheArray([...theArray, `Entry ${theArray.length}`]);
    };
    return [
        ,
        
{theArray.map(entry =>
{entry}
)}
]; } ReactDOM.render( , document.getElementById("root") );

Tags:

Misc Example