如何使用数组条件过滤数组 [英] How to filter array with array condition

问题描述

var students = ["Malcom", "Jayne"];
var persons = [
    {firstname : "Malcom", lastname: "Reynolds"},
    {firstname : "Kaylee", lastname: "Frye"},
    {firstname : "Jayne", lastname: "Cobb"}
];

我想用学生数组过滤（或映射，forEach随便什么）人数组。
学生数组是动态的，因此可以更改其长度。

I want to filter(or map, forEach whatever) persons array with students array. Students array is dynamic, so its length can be changed.

有什么想法吗？

推荐答案

可以使用过滤器和 some 来完成。

var students = ["Malcom", "Jayne"];

var persons = [
    {firstname : "Malcom", lastname: "Reynolds"},
    {firstname : "Kaylee", lastname: "Frye"},
    {firstname : "Jayne", lastname: "Cobb"}
];

console.log(persons.filter(person => students.some(student => student == person.firstname)))

// An advice, maybe you want to put everything to lower case
// to prevent a wrong result because of case mismatch
// (e.g. "Malcom" !== "malcom"). 
// It would be:

persons.filter(person => students.some(student => student.toLowerCase() === person.firstname.toLowerCase()))

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