如何使用另一个对象数组中的名称过滤对象数组 [英] How to filter an array of objects with names from another array of objects

问题描述

我是Java的新手，我在如何使用地图，过滤器，查找和其他功能方面苦苦挣扎.我有两个对象数组，我想用第二个对象过滤第一个对象.

I'm new to Javascript and I'm struggling with how to use the map, filter, find and other functions. I have two arrays of objects, and I wanted to filter the first one with the second.

const users = [ 
  { name: 'Anna', age: 22, gender: 'F' }, 
  { name: 'John', age: 25, gender: 'M' },
  { name: 'Mary', age: 27, gender: 'F' },
  { name: 'Joe',  age: 30, gender: 'M' } 
] 

const filter = [ 
  { name: 'Anna' }, 
  { name: 'John' } 
] 

// Here is the expected result:
const expected_result = [ 
  { name: 'Anna', age: 22, gender: 'F' },
  { name: 'John', age: 25, gender: 'M' } 
] 

有人知道这样做的最好方法是什么吗?

Does anyone know what is the best way to do this?

推荐答案

最佳方法是什么"是一个见解，但是如果您有一个较大的过滤器对象，则首先将其转换为临时集是很有意义的:

"What is the best way" is a matter of opinion, but if you would have a large filter object, then it makes sense to first convert it to a temporary set:

function filterBy(users, filter) {
    let set = new Set(filter.map(({name}) => name)); // for faster lookup
    return users.filter(({name}) => set.has(name));
}

// demo
const users = [{name: 'Anna',age: 22,gender: 'F',},{name: 'John',age: 25,gender: 'M',},{name: 'Mary',age: 27,gender: 'F',},{name: 'Joe',age: 30,gender: 'M',},];
const filter = [{name: 'Anna',},{name: 'John',}];
console.log(filterBy(users, filter));

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