subject.ts

class Subject {
    id: number;
    name: string;

    constructor(id, name) {
        this.id = id;
        this.name = name;
    }
}

class Student {
    subjects: Subject[] = [];
    
    constructor() {
        
    }

    addSubject() {
        this.subjects.push(new Subject(1, 'nuevo subject'));
    }
}