I have an array of categories. Categories can have some tasks and I want to count the number of tasks.

const categories = [
    {
        id: 1,
        icon: '⚒️',
        name: 'work',
        color: 'bg-[#F8A94B]',
        tasks: [
            { id: 1, description: 'Do A', completed: true },
            { id: 2, description: 'Do B', completed: false },
            { id: 3, description: 'Do C', completed: false },
            { id: 4, description: 'Do D', completed: true },
            { id: 5, description: 'Do E', completed: false },
            { id: 6, description: 'Do F', completed: true },
        ],
    },
    {
        id: 2,
        name: 'home',
        icon: '