Generics Introduction: Class and interface using generics

Attributes.ts

export interface StudentProps {
    id: number;
    name: string;
  }
  
  export interface TeacherProps {
    id: number;
    name: string;
    isGoodTeacher: boolean;
  }
  
  export class Attributes<T> {
  
    constructor(private data: T) {}
  
    get<K extends keyof T>(key: K): T[K] {
      return this.data[key];
    }
  
    set(update: T): void {
      this.data = {...this.data, update}
    }
  }
  
  const studentAttributes = new Attributes<StudentProps>({id: 1, name: 'Ragnar'});
  const studentName = studentAttributes.get('name');
  console.log(typeof studentName); // prints string
  
  const teacherAttributes = new Attributes<TeacherProps>({id: 1, name: 'Lagertha', isGoodTeacher: true});
  const isGoodTeacher = teacherAttributes.get('isGoodTeacher');
  console.log(typeof isGoodTeacher); // prints boolean