Generics Introduction: Sync function using generics

SyncWithGenerics.ts

const rootUrl = "https://path_to_your_server/students";

class Student {
 public sync: Sync<StudentProps> = new Sync<StudentProps>(rootUrl)
}

interface HasId {
  id?: number;
}

class Sync<T extends HasId> {

  constructor(public rootUrl: string) {}

  save(data: T): void {
   
    const { id } = data;

    if (id) {
      return axios.put(`${this.rootUrl}/id`, data);
    }
   
    return axios.post(this.rootUrl, data);
   
  }

}