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What is TypeScript in Angular 2?

What is TypeScript?

TypeScript is a strongly typed, object oriented and compiled language and this language developed and maintained by Microsoft. It was designed by “Anders Hejlsberg” at Microsoft.

It is a superset of JavaScript.  The TypeScript is JavaScript and also has some additional features like static typing and class-based object-oriented programming, automatic assignment of constructor parameters and assigned null values and so on.

Stayed Informed – Learn Angular 2

The entire JavaScript program is valid for TypeScript because the entire TypeScript (.ts) file converted to JavaScript (.js) file after compiled source compiled and this process is automatic.
See in the below compiled project pic.

TypeScript adds support for features such as classes, modules and arrow function syntax as proposed in the ECMAScript 2015 standard.

How to use arrow function?

interface IStudent {
    yearOfBirth: number;
    age : () => number;

//Base Class
class College {
    constructor(public name: string, public city: string) {

//Child Class implements IStudent and inherits from College
class Student extends College implements IStudent {
    firstName: string;
    lastName: string;
    yourAge: number;

    constructor(firstName: string, lastName: string, name: string, city: string, yourAge: number) {
        super(name, city);

        this.firstName = firstName;
        this.lastName = lastName;
        this.yourAge = yourAge;

    age () { 
        return this.yourAge;

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