TypeScript 2.x By Example

Super

Super is a TypeScript keyword that refers to the parent class. If we define a constructor to the child class, it's mandatory to call the constructor of the parent class explicitly, using the super keyword. In the following example, we have a constructor for our child class, TypeScript:

class Book {  constructor(public author:string,     public title:string, public length: number){  }  getFullTitle(): string {    return `${this.title} by ${this.author}`;  };}class TypeScript extends Book{  constructor(author:string,title:string,     length: number, public releaseDate:string){    super(author,title,length);  }}

In this case, we need to call super so as to pass the required parameters to the constructor function of the parent class. 

If the parent's constructor ...