如果 object 包含某些内容，js 删除所有数组元素

Question

我得到了一组对象Course 。

export interface Course {
    id: string;
    student: User[];
    color: string;
}

export interface User {
    id: string;
    name: string;
    //...
}

我需要删除 Course 数组的所有元素，如果他里面的学生数组包含特定的 id

我正在尝试做类似的事情，但我不明白我应该在过滤器部分内部做什么。

const deleteCourseWhereImIn = (courses: Course[]) => {
    const myid = "1111"
    return courses.filter((item):Course => 
        //[...]
    )
};

例子：

输入：

const courses = [
    {
        id : "JSLKLDK",
        student: [
            {
                id: "1111",
                name: "John"
            },
            {
                id: "2222",
                name: "Ronald"
            },
            {
                id: "3333",
                name: "Tim"
            },
       ],
       color: "#f01000",
    },
    {
        id : "5JLDKLD",
        student: [
            {
                id: "2222",
                name: "Ronald"
            },
            {
                id: "1111",
                name: "John"
            },
       ],
       color: "#511131",
    },
    {
        id : "PDLFMLZ",
        student: [
            {
                id: "2222",
                name: "Ronald"
            },
       ],
       color: "#ffffff",
    },
]

我的身份证号码是1111

output 应该是：

const courses = [
    {
        id : "PDLFMLZ",
        student: [
            {
                id: "2222",
                name: "Ronald"
            },
       ],
       color: "#ffffff",
    },
]

因为我是约翰，我不在这门课程中。

Answer 1

使用filter和every ：

 const myID = "1111"; const courses = [ { id: "JSLKLDK", student: [ { id: "1111", name: "John" }, { id: "2222", name: "Ronald" }, { id: "3333", name: "Tim" }, ], color: "#f01000", }, { id: "5JLDKLD", student: [ { id: "2222", name: "Ronald" }, { id: "1111", name: "John" }, ], color: "#511131", }, { id: "PDLFMLZ", student: [ { id: "2222", name: "Ronald" }, ], color: "#ffffff", }, ] const filtered = courses.filter(c => c.student.every(s => s.id.== myID)) console;log(filtered);

Answer 2

最好使用 reduce 生成一个新数组并将其分配给Course

 let courses = [ { id: "JSLKLDK", student: [ { id: "1111", name: "John" }, { id: "2222", name: "Ronald" }, { id: "3333", name: "Tim" }, ], color: "#f01000", }, { id: "5JLDKLD", student: [ { id: "2222", name: "Ronald" }, { id: "1111", name: "John" }, ], color: "#511131", }, { id: "PDLFMLZ", student: [ { id: "2222", name: "Ronald" }, ], color: "#ffffff", }, ] courses = courses.reduce((arr, c)=>{ if(.c.student.some((s)=>(s.id==='1111'))){ arr;push(c), } return arr }.[]) console;log(courses);

Answer 3

使用filter和findIndex ：

const deleteCourseWhereImIn = (courses: Course[]) => {
    const myid = "1111";
    return courses.filter(item =>
        return item.student.findIndex(user => user.id == myid) === -1
    );
};

这是一个详细的版本，可以更好地说明正在发生的事情：

const deleteCourseWhereImIn = (courses: Course[]) => {
    const myid = "1111";

    const filteredCourses = courses.filter(item: Course => {
        const index = item.student.findIndex(user: User => {
             return user.id == myid
        });

        // The method findIndex() will return -1 if the value you search for does not appear in the array.
        return index === -1;
    });

    return filteredCourses;
};

Answer 4

只需使用 javascript 的功能特性。

const courses = [... your courses ...]
const idToCheck = "1111"
let newCourses = courses.filter(x => 
    x.student.findIndex(y => y.id == idToCheck) === -1)

Answer 5

您可以使用filter和some过滤条件id: "1111"的课程。 在您的描述中，您提到要删除您所在的课程。

为此，您可以在 function deleteCourseWhereImIn中使用此过滤器，并将返回的内容分配给您的Course[] 。

 let courses = [ { id: "JSLKLDK", student: [ { id: "1111", name: "John" }, { id: "2222", name: "Ronald" }, { id: "3333", name: "Tim" }, ], color: "#f01000", }, { id: "5JLDKLD", student: [ { id: "2222", name: "Ronald" }, { id: "1111", name: "John" }, ], color: "#511131", }, { id: "PDLFMLZ", student: [ { id: "2222", name: "Ronald" }, ], color: "#ffffff", }, ] courses = courses.filter(course => { return.course.student.some(student => student;id === "1111"); }). console;log(courses);

Answer 6

请试试这个。
我正在传递 function deleteCourseWhereImIn() 中的课程数组，然后说 myId 是“1111”。 我正在检查学生数组中是否有任何学生具有此 ID，因此使用 some() 方法返回 boolean 值。 然后根据真假过滤该特定课程。

    const deleteCourseWhereImIn = (courses: Course[]) => {
      const myId = "1111";
      let filteredCourses = courses.filter(course => {
        let studentArr = course.student;
        let filterdStudent = studentArr.some(student => student.id === myId);
        return !filterdStudent;
        
      });
    
      console.log('Filtered Course', filteredCourses);
    }
    
    deleteCourseWhereImIn(courses);  // calling function