JavaScript该怎么分组求和

Question

<script>
        // name为图书的名称, price为图书的单价，number为图书的数量，series为该图书的种类
        let book = [
            { name: "book1", price: "41.50", number: "20", series: "科技" },
            { name: "book2", price: "24.00", number: "30", series: "动漫" },
            { name: "book3", price: "33.00", number: "40", series: "航空" },
            { name: "book4", price: "27.50", number: "50", series: "科技" },
            { name: "book5", price: "58.50", number: "60", series: "航空" },
            { name: "book6", price: "18.75", number: "70", series: "动漫" },
            { name: "book7", price: "31.00", number: "80", series: "科技" },
            { name: "book7", price: "36.00", number: "90", series: "动漫" }
        ];
        
        // 求出 每个种类有多少本图书， 例如航空类别的有100本书
    </script>  

Answer 1

先遍历book数组筛选出同类别的书本，一样类别书本的再将它们的number属性加起来就得到最后的总数