javascript - 从数组中获取特定值并将值转换为另一个数组

Question

我有一个如下所示的数组

[{
"title": "Apple iPhone 7 Plus 32 GB",
"category": "phone",
"brand": "apple",
"condition": "Used",
"price": 800,
"id": 0,
"description": "Apple"
}, {
    "title": "Apple Ipad Air 32 GB",
    "category": "tablet",

    "brand": "apple",
    "condition": "new",
    "price": 1000,
    "id": 1,
    "description": "Apple"
},{
    "title": "Supreme Box Logo Hooded Sweatshirt Navy",
    "category": "clothes",
    "brand": "Supreme",
    "condition": "new",
    "price": 1000,
    "id": 2,
    "description": "Supreme Size M"
},]

如何从上面的数组中只获取类别的值并将它们转换为这样的数组？

[{"phone","clothes","tablet"}]

Answer 1

只需映射数组并获取每个数组的类别。

此外，[{"phone","clothes","tablet"}] 无效；对象是键和值对，所以我假设您的意思是 ["phone","clothes","tablet"]

const items = [{
"title": "Apple iPhone 7 Plus 32 GB",
"category": "phone",
"brand": "apple",
"condition": "Used",
"price": 800,
"id": 0,
"description": "Apple"
}, {
    "title": "Apple Ipad Air 32 GB",
    "category": "tablet",

    "brand": "apple",
    "condition": "new",
    "price": 1000,
    "id": 1,
    "description": "Apple"
},{
    "title": "Supreme Box Logo Hooded Sweatshirt Navy",
    "category": "clothes",
    "brand": "Supreme",
    "condition": "new",
    "price": 1000,
    "id": 2,
    "description": "Supreme Size M"
},];

const newItems = items.map(item => item.category);
console.log(newItems)