Create instance of object in typescript Angular 2

Question

How to create new instance in TypeScript. Obviously I'm not matching the constructor but I can't see what's wrong.

export class User implements IUser {
    public id: number;
    public username: string;
    public firstname: string;
    public lastname: string;
    public birthday: string;
    public email: string;

    public constructor(iUser: IUser)
    {
        this.id = iUser.id;
        this.username = iUser.username;
        this.firstname = iUser.firstname;
        this.lastname = iUser.lastname;
        this.birthday = iUser.birthday;
        this.email = iUser.email;
    }
}

    interface IUser {
        id?: number;
        username: string;
        firstname: string;
        lastname: string;
        birthday: string;
        email: string;
    }

And student class that extends user

export class Student extends User implements IStudent, IUser {
    public indeks: string;
    public studyProgram: StudyProgram;


    public constructor(iUser: IUser, iStudent: IStudent)
    {
        super(iUser);
        this.indeks = iStudent.indeks;
        this.studyProgram = iStudent.studyProgram;
    }
}

    interface IStudent {
        indeks: string;
        studyProgram: StudyProgram;
    }

So, when I try to create new instance of student I got this error

 Supplied parameters do not match any signature of call target.

     this.student = new Student ({
      username: '',
      firstname: '',
      lastname: '',
      birthday: '',
      email: '',
      indeks: '',
      studyProgram: new StudyProgram({
        name: '',
        duration: 0,
        courseType: ''
    })
  });

And here is StudyProgram class

export class StudyProgram implements StudyProgramInterface {
        public id: number;
        public name: string;
        public duration: number;
        public courseType: string;
        public studentList: Array<Student>;

    public constructor(studyProgramCfg: StudyProgramInterface) {
        this.id = studyProgramCfg.id;
        this.name = studyProgramCfg.name;
        this.duration = studyProgramCfg.duration;
        this.courseType = studyProgramCfg.courseType;
    }
}

    interface StudyProgramInterface {
        id?: number;
        name: string;
        duration: number;
        courseType: string;
    }

Khalid · Accepted Answer · 2018-10-09 17:04:06Z

1

The Student class constructor is expecting two objects (one implementing IStudent, and the other implementing IUser), you are passing only one. I think the constructor you are looking for is:

public constructor(student: IUser & IStudent) {
    super(student);
    this.indeks = student.indeks;
    this.studyProgram = student.studyProgram;
}

You can find more about intersection types here: https://basarat.gitbooks.io/typescript/content/docs/types/type-system.html

answered Oct 9, 2018 at 17:04

Khalid

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