Check out example codes for "create model class angular". It will help you in understanding the concepts better.

Code Example 1

// to create a model class, we first need to create a new file
//f.e person.ts

export class Person {
 constructor(
  public name: string,
   public lastName: string,
   public age:number
  
  ) {}
}

//now that we have the model class we can create arrays that contain Person class elements

.
.
public people: Person[];
constructor(){
 this.people = [
   new Person ('Carla','Smith', 20 ),
    new Person ('Carlos','Smith', 25 ),
    new Person ('Andrea','Johnson', 23 ),
   
   ];
}

Learn ReactJs, React Native from akashmittal.com