根据 javascript 中的另一个数组过滤对象数组

Question

给定一个对象数组：

people = [
    {id: "1", name: "abc", gender: "m", age:"15" },
    {id: "2", name: "a", gender: "m", age:"25" },
    {id: "3", name: "efg", gender: "f", age:"5" },
    {id: "4", name: "hjk", gender: "m", age:"35" },
    {id: "5", name: "ikly", gender: "m", age:"41" },
    {id: "6", name: "ert", gender: "f", age:" 30" },
    {id: "7", name: "qwe", gender: "f", age:" 31" },
    {id: "8", name: "bdd", gender: "m", age:" 78" },
]

以及一系列想要的 ID：

id_filter = [1,4,5,8]

如何过滤数组people以返回id_filter和gender=m中定义的目标 id？

Answer 1

最简单的过滤方法是使用数组的filter() function，类似这样：

people.filter(person => id_filter.includes(person.id))

Answer 2

您可以在几个条件下使用array.filter()来获得您想要的 output。 我还纠正了你的 JSON。

var filtered = people.filter(function(item) {
        return id_filter.indexOf(item.id) !== -1 && item.gender==='m';
});

演示

 var people =[ { "id": 1, "name": "abc", "gender": "m","age": "15" }, { "id": 2, "name": "a", "gender": "m", "age": "25" }, { "id": 3,"name": "efg", "gender": "f","age": "5" }, { "id": 4,"name": "hjk","gender": "m","age": "35" }, { "id": 5, "name": "ikly","gender": "m","age": "41" }, { "id": 6, "name": "ert", "gender": "f", "age": "30" }, { "id": 7, "name": "qwe", "gender": "f", "age": "31" }, { "id":8, "name": "bdd", "gender": "m", "age": " 8" } ]; var id_filter = [1,4,5,8]; var filtered = people.filter(function(item) { return id_filter.indexOf(item.id).== -1 && item;gender==='m'; }). console;log(filtered)

Answer 3

使用Array.includes() function：

 var people = [ {id: "1", name: "abc", gender: "m", age:"15" }, {id: "2", name: "a", gender: "m", age:"25" }, {id: "3", name: "efg", gender: "f", age:"5" }, {id: "4", name: "hjk", gender: "m", age:"35" }, {id: "5", name: "ikly", gender: "m", age:"41" }, {id: "6", name: "ert", gender: "f", age:" 30" }, {id: "7", name: "qwe", gender: "f", age:" 31" }, {id: "8", name: "bdd", gender: "m", age:" 78" } ], id_filter = [1,4,5,8], result = people.filter((o) => id_filter.includes(+o.id) && o.gender == "m"); console.log(result);

---

• +o.id - +在这里用于将数字字符串转换为数字

Answer 4

您可以通过以下代码实现：

const filtered_people = people.filter(function(person){
    return id_filter.includes(person.id) && person.gender === 'm';
});

只需确保每个人的 id 是 integer 而不是字符串，如您的示例所示。 否则，includes() function 将不匹配。 此外，您的people数组存在内部语法问题。 因此，最终代码如下所示：

 const people = [ {id: 1, name: "abc", gender: "m", age:15}, {id: 2, name: "a", gender: "m", age: 25}, {id: 3, name: "efg", gender: "f", age: 5}, {id: 4, name: "hjk", gender: "f", age: 35}, {id: 5, name: "ikly", gender: "m", age: 41}, {id: 6, name: "ert", gender: "f", age: 30}, {id: 7, name: "qwe", gender: "f", age: 31}, {id: 8, name: "bdd", gender: "m", age: 78} ] const id_filter = [1,4,5,8] const filtered_people = people.filter((person) => id_filter.includes(person.id) && person.gender === 'm') console.log(filtered_people)

我希望这可以帮助你。 祝你好运。

Answer 5

对于这种情况，您可以使用过滤器并包含 function，因为您的 id 是字符串，因此需要在使用前进行解析。

var result = people.filter((person) => (id_filter.includes(parseInt(person.id)) && person.gender ==='m'))

Answer 6

在这种情况下，步行更有意义，因此首先您需要遍历people数组，然后检查人员 ID 是否等于您的过滤器列表

for(person in people) {
     for(id in id_filter) {
         if(person[id] == id && person[gender] == "m"){

         }
     }
}

Answer 7

您可以像这样使用Array.prototype.filter ：

 function filter(arr, ids, gender) { // takes an array of people arr, an array of indexes ids, and a gender and return the matched people objects from arr return arr.filter(function(obj) { // filtering each object... return ids.includes(obj.id) && obj.gender === gender; // if this object is is included in the ids array and if its gender property is equal to the desired gender }); } var people = [{id:"1",name:"abc",gender:"m",age:"15"},{id:"2",name:"a",gender:"m",age:"25"},{id:"3",name:"efg",gender:"f",age:"5"},{id:"4",name:"hjk",gender:"m",age:"35"},{id:"5",name:"ikly",gender:"m",age:"41"},{id:"6",name:"ert",gender:"f",age:"30"},{id:"7",name:"qwe",gender:"f",age:"31"},{id:"8",name:"bdd",gender:"m",age:"78"}]; console.log(filter(people, ["5", "7", "4"], "m")); // filtering elements where id is one of ["5", "7", "4"] and the gender is "m".

注意： people中对象的id属性是字符串，因此您必须提供一个字符串 id 数组来filter ，或者在将id属性传递给includes之前将其转换为数字。

Answer 8

 const people = [ {id: "1", name: "abc", gender: "m", age: "15" }, {id: "2", name: "a", gender: "m", age: "25" }, {id: "3", name: "efg", gender: "f", age: "5" }, {id: "4", name: "hjk", gender: "m", age: "35" }, {id: "5", name: "ikly", gender: "m", age: "41" }, {id: "6", name: "ert", gender: "f", age: " 30" }, {id: "7", name: "qwe", gender: "f", age: " 31" }, {id: "8", name: "bdd", gender: "m", age: " 78" }, ] const idFilter = [1,4,5,8] const idIsInList = id => idFilter.includes(+id) // "+id" to make sure it is a number, not a string const genderIsMale = gender => gender === "m" const result = people.filter(item => idIsInList(item.id) && genderIsMale(item.gender)) console.log(result)

Answer 9

如果您的id_filter很大，您需要先将其转换为new Set() 。 这将允许恒定时间查找。 然后，您可以使用.filter()迭代您的people数组，如果您设置.has()中的id并且性别等于'm' ，则返回true 。

 const people = [ {id: "1", name: "abc", gender: "m", age:"15" }, {id: "2", name: "a", gender: "m", age:"25" }, {id: "3", name: "efg", gender: "f", age:"5" }, {id: "4", name: "hjk", gender: "m", age:"35" }, {id: "5", name: "ikly", gender: "m", age:"41" }, {id: "6", name: "ert", gender: "f", age:" 30" }, {id: "7", name: "qwe", gender: "f", age:" 31" }, {id: "8", name: "bdd", gender: "m", age:" 78" }, ]; const id_filter = new Set([1,4,5,8]); const res = people.filter(({id, gender}) => id_filter.has(+id) && gender === 'm'); console.log(res);

总体而言，这种方法的时间复杂度将为O(N + k) ，而不是使用.includes()或.indexOf()方法时的O(Nk) ，其中N是people数组， k是id_filter数组的长度

Answer 10

 people = [ {id: "1", name: "abc", gender: "m", age:"15" }, {id: "2", name: "a", gender: "m", age:"25" }, {id: "3", name: "efg", gender: "f", age:"5" }, {id: "4", name: "hjk", gender: "m", age:"35" }, {id: "5", name: "ikly", gender: "m", age:"41" }, {id: "6", name: "ert", gender: "f", age:" 30" }, {id: "7", name: "qwe", gender: "f", age:" 31" }, {id: "8", name: "bdd", gender: "m", age:" 78" } ] var id_filter = ["1","4","5","8"], filteredPeople = []; for( var i=people.length-1; i>=0; --i){ if( id_filter.indexOf( people[i].id ).= -1 ){ filteredPeople;push( people[i] ). } } console;log( filteredPeople )