javascript - 使用可选值过滤集合

Question

我有一个问题:我知道如何使用 Array.prototype.filter，但我无法想象如何使用可选键过滤掉项目。例如:

[
    {item: 1, paths: {category: "country", name: "England", access: 2},
    {item: 3, paths: {category: "country", name: "Russia", access: 2},
    {item: 2, paths: {category: "country", name: "Portugal", access: 0}
]

我想通过路径选择性地过滤掉它们，比方说通过对象的形状:

{category: "country", access: 2}

我怎样才能实现这样的目标？

Answer 1

您可以在过滤器中编写一个自定义比较器，将比较器对象的所有值与类似的项目进行比较

const data = [
 {item: 1, paths: {category: "country", name: "England", access: 2}},
 {item: 3, paths: {category: "country", name: "Russia", access: 2}},
 {item: 2, paths: {category: "country", name: "Portugal", access: 0}}
]

const comparator = {category: "country", access: 2};

const compareObjectKeys = (comparator, item) => {
    return Object.keys(comparator).every(key => {
        return item.paths[key] === comparator[key];
    })
}
const res = data.filter(item => {
   return compareObjectKeys(comparator, item);
})

console.log(res)