sortByDate

    // SORT BY DATE (TOGGLE)
    const sortByDate = () => {
        if (new Date(inventory[0].expiration_date).valueOf() < new Date(inventory[inventory.length -1 ].expiration_date).valueOf()) {
            const sortedInventory = inventory.slice(0).sort((a: Inventory, b:Inventory) => {return new Date(b.expiration_date).valueOf() - new Date(a.expiration_date).valueOf()})
            setInventory(sortedInventory)
        } else {
            const sortedInventory = inventory.slice(0).sort((a: Inventory, b:Inventory) => {return new Date(a.expiration_date).valueOf() - new Date(b.expiration_date).valueOf()})
            setInventory(sortedInventory)
        }
    }