javascript - 有两个对象的数组，在这些数组中，如果 ID 相同，我想匹配 ID，我需要新数组，其中包含相同 ID 的组合信息

Question

我需要通过匹配 ID 从两个数组中收集数据并将该数据推送到一个新数组中。

我试过通过循环来做这些事情，但它不能准确地推送。在第一个循环中，我迭代了学生的数组，在第二个循环中，我以类(class)数组的内部循环为目标。

var students = [
    {
        _id: 'std1',
        name: 'Bill Gates',
        age: 30
    },
    {
        _id: 'std2',
        name: 'Steve Jobs',
        age: 30
    },
    {
        _id: 'std3',
        name: 'Suzanne Collins',
        age: 30
    }];

var courses = [
    {
        name: 'Maths',
        std_id: ['std3', 'std1']
    },
    {
        name: 'Computer Science',
        std_id: ['std3', 'std2']
    },
    {
        name: 'Commerce',
        std_id: ['std1']
    },
]

var sorted = [];
for(var i=0; i<students.length; i++){
    for(var j=0; j<courses.length; j++){
        if(students[i]._id == courses[j].std_id){
            sorted.push({'name' : students[i].name, 'studen ID' :students[i]._id, 'courses' :[courses[j].name]})

        }
    }

}

console.log(sorted);

{
    course: ['Maths','Commerce']   
    name: 'Bill Gates',
    studentId: 'std1'
}

Answer 1

试试这个:

var students = [
    {
        _id: 'std1',
        name: 'Bill Gates',
        age: 30
    },
    {
        _id: 'std2',
        name: 'Steve Jobs',
        age: 30
    },
    {
        _id: 'std3',
        name: 'Suzanne Collins',
        age: 30
    }];

var courses = [
    {
        name: 'Maths',
        std_id: ['std3', 'std1']
    },
    {
        name: 'Computer Science',
        std_id: ['std3', 'std2']
    },
    {
        name: 'Commerce',
        std_id: ['std1']
    },
]

let sortedArr = [];

for(let i = 0; i < students.length; i++) {
    let stCourse = [];
    for(let j = 0; j < courses.length; j++) {
        if(courses[j].std_id.includes(students[i]._id)) {
            stCourse.push(courses[j].name)
        }
    }
    sortedArr.push({name: students[i].name, 'studen ID': students[i]._id, courses: stCourse})
}

console.log(sortedArr)