UseState() hook returns undefined when using option chained value as initial count in React js.

Answer.  maybe your find method return undefined because state is undefined

const get = (data) => {
        const inventoryId = 8;
        const selectedInventory = data.find(
            inventory => inventory.id === inventoryId
        );
        return selectedInventory;
    }
    const totalQuantity = get([{id: 4,quantity:888 }, {id: 8, quantity:88 }, {id: 9, quantity:787}]);
    const [carQuantity, setCarQuantity] = React.useState(totalQuantity);

    console.log(carQuantity);