add to array usestate code example

Example 1: React Hooks append state

setTheArray(currentArray => [...currentArray, newElement])

Example 2: usestate array push

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

Example 3: 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")
);

Example 4: add items to a react array in hooks

const addMessage = (newMessage) => setMessages(state => [...state, newMessage])