根据键过滤json并将其与数组中的一个值匹配[重复]答案

【问题标题】：Filter json based on key and match it against one of the values from array [duplicate]根据键过滤json并将其与数组中的一个值匹配[重复]
【发布时间】：2021-12-27 17:55:34
【问题描述】：

我有 json 文件：products.json:

[
{
"id": "1",
"category": "Fruit from USA",
"name": "Banana",
},
{
"id": "2",
"category": "Fruit from Brazil",
"name": "Long Banana",
},
{
"id": "3",
"category": "Vegetable",
"name": "Carrot",
},
{
"id": "4",
"category": "Car from USA",
"name": "Ford",
},
{
"id": "5",
"category": "Car from Germany",
"name": "Audi",
},
{
"id": "6",
"category": "Train from Italy",
"name": "Pendolino",
},
]

然后我有一个数组

testMatch.match: ['Car', 'Fruit'].

我想过滤掉 products.json 以仅返回类别以 ES6 中 matchCategory 的任何元素开头的对象

我目前拥有的是：

const productList = products.filter(filteredCategory => filteredCategory.category.startsWith(testMatch.match));

但如果 testMatch.match 中有超过 1 个元素并且没有元素，则它不起作用 - 它返回所有产品而不是无。

【问题讨论】：

您只需要扩展您当前的代码，1. 添加一个检查它是否是一个数组。 2. 遍历 testMatch.match 并查找是否有任何类别以它开头。

标签： javascript arrays

【解决方案1】：

您也可以使用Array#some 迭代match 并在查找时退出。

const
    products = [{ id: "1", category: "Fruit from USA", name: "Banana" }, { id: "2", category: "Fruit from Brazil", name: "Long Banana" }, { id: "3", category: "Vegetable", name: "Carrot" }, { id: "4", category: "Car from USA", name: "Ford" }, { id: "5", category: "Car from Germany", name: "Audi" }, { id: "6", category: "Train from Italy", name: "Pendolino" }],
    match = ['Car', 'Fruit'],
    productList = products.filter(({ category }) =>
        match.some(m => category.startsWith(m))
    );

console.log(productList);

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

【讨论】：

【解决方案2】：

使用Array.some() 测试它是否以testMatch.match 中的任何字符串开头。

const products = [{
    "id": "1",
    "category": "Fruit from USA",
    "name": "Banana",
  },
  {
    "id": "2",
    "category": "Fruit from Brazil",
    "name": "Long Banana",
  },
  {
    "id": "3",
    "category": "Vegetable",
    "name": "Carrot",
  },
  {
    "id": "4",
    "category": "Car from USA",
    "name": "Ford",
  },
  {
    "id": "5",
    "category": "Car from Germany",
    "name": "Audi",
  },
  {
    "id": "6",
    "category": "Train from Italy",
    "name": "Pendolino",
  },
];

const testMatch = {
  match: ['Car', 'Fruit']
};

const productList = products.filter(filteredCategory =>
  testMatch.match.some(match => filteredCategory.category.startsWith(match)));

console.log(productList);

【讨论】：