javascript - 创建嵌套对象数组 Javascript

Question

我在下面的 json 中有一个类(class)列表。我试图获得所需的输出来制作我想要的数组，但我在制作新数组时遇到了问题。

我尝试使用下面的代码片段获取它，但在使用 [courses[i].client_id] 和 结果 时显示错误。

let courses = [
    {course_id: 1, name: "Test1", description: "Test1 desc", video_url: "111", client_id: 1},
    {course_id: 3, name: "A new course", description: "This is a temporary description used to test functionality. ", video_url: "https://vimeo.com/", client_id: 1},
    {course_id: 5, name: "Teaching", description: "programming language", video_url: "https://vimeo.com", client_id: 1},
    {course_id: 13, name: "Course285", description: "desc285", video_url: "", client_id: 2},
    {course_id: 16, name: "The NEW", description: "The Course is an  training", video_url: "https://vimeo.com/", client_id: 1}
]

let result = [];

for (let i = 0; i < courses.length; i++) {
    if (courses && courses.length) {
        result[i][courses[i].client_id] = {
            clientId: courses[i].client_id
        } ;
    }
}

预期输出

[
    {client_id: 1, courses:[{
        course_id:1,
        course_name: Test1,
        course_desc: description
    },{
        course_id:2,
        course_name: Test1,
        course_desc: description
    }]},
    {client_id:2,courses[{
        ....
    }]}
]

Answer 1

我的减少案例:

const userCourses = courses.reduce((acc, rec) => {
  const user = acc.find(a=>a.client_id === rec.client_id)
  if (user) {
    user.courses = [...user.courses, {course_id:rec.course_id, course_name: rec.name, course_desc: rec.description}]
    return [...acc]
  }
  return [...acc, { client_id: rec.client_id, courses: [{course_id: rec.course_id, course_name: rec.name, course_desc: rec.description}] }]
}, [])

在 Playground 上查看:https://jscomplete.com/playground/s538993