Question

我有两个数组

array1 = [
    {name: "samsung", views: 1200},
    {name: "apple", views: 200}
]

array2 = [
    {name: "samsung-1234", views: 200},
    {name: "apple-2332", views: 200},
    {name: "samsung-6543", views: 400},
    {name: "samsung-9876", views: 600}
]

在array2中，如何获取sumsung有3种类型，apple具有1类型。

谢谢。感谢您的帮助

Answer 1

您可以在array2上使用.filter()并从name中指定array1来建立过滤器，并用.includes()来比较名称

let array1 = [
    {name: "samsung", views: 1200},
    {name: "apple", views: 200}
];

let array2 = [
    {name: "samsung-1234", views: 200},
    {name: "apple-2332", views: 200},
    {name: "samsung-6543", views: 400},
    {name: "samsung-9876", views: 600}
];


let result = array1.map(x => ({ name: x.name, total: array2.filter(a => a.name.includes(x.name)).length }));

console.log(result);

Answer 2

您可以拍摄一张地图以统计发生次数并更新array1。

var array1 = [{ name: "samsung", views: 1200 }, { name: "apple", views: 200 }],
    array2 = [{ name: "samsung-1234", views: 200 }, { name: "apple-2332", views: 200 }, { name: "samsung-6543", views: 400 }, { name: "samsung-9876", views: 600 }];
    types = new Map(array1.map(o => ([o.name, Object.assign(o, { types: 0 })])));
    
array2.forEach(({ name }) => ++types.get(name.split('-')[0]).types);

console.log(array1);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 3

array1.map(el => {
    return array2.filter(el2 => {
        return el2.name.includes(el.name)
    })
})

对您有帮助吗？

Answer 4

我不确定我是否了解第一个数组的含义，但是可以通过简单的for循环使用Samsung获得项目数。

let cnt = 0;
array2.forEach((val) => {if (val.name.match(/samsung/i)) { cnt++}})
console.log(cnt) // 3

Answer 5

array1 = [
    {name: "samsung", views: 1200},
    {name: "apple", views: 200}
]

array2 = [
    {name: "samsung-1234", views: 200},
    {name: "apple-2332", views: 200},
    {name: "samsung-6543", views: 400},
    {name: "samsung-9876", views: 600}
]

const result = array1.map(brand => {
    let howManyTypes = array2.filter(ele =>  ele.name.indexOf(brand.name) != -1).length;
    return {name: brand.name, howManyTypes}
})

console.log(result)

从另一个数组获取第一个数组的属性的长度

5 个答案: