Class field constructor function TypeScript

How to create fields, constructor and function in TypeScript Class?

What is class in TypeScript?

A class is a template definition of the methods and variables in a particular kind of object. It is extensible program, code and template for creating objects.

A TypeScript is object oriented JavaScript and it also supports object oriented programming features like classes, interfaces, etc.


A class captains the Public, Private, Protected and Read-only modifiers and Public by default.
You can see the below example, the class User and each members are public by default.


A class definition can contains the following –
1.     Fields
2.     Constructors
3.     Functions

Example – Use of class field, constructor and function i.e.
//Example 1- A simple class based example.
class User { // Calss
    name: string; //field
    constructor(nameTxt: string) { //constructor
        this.name = nameTxt;
    }

    getName() {//function
        return "Hello, " + this.name;
    }
}

let user = new User("Anil");//Creating Instance objects

How Static class in typescript?
We can define a class with static properties i.e.

export class Constants {
    static baseUrl = 'http://localhost:8080/';
    static date = new Date();
}

Ways to declare a nest class structure in typescript?

//Example 1-
declare module a{

    class b {
    }

    module b {
        class c {
        }
    }
}

var clB = new a.b();
var clC = new a.b.c();

//Example 2-
export module a {
    export class b {
    }

    export module b {
        export enum c {
            C1 = 1,
            C2 = 2,
            C3 = 3,
        }
    }
}

//Example 3-
class A {
    static B = class { }
}

var a = new A();
var b = new A.B();

Stayed Informed – Learn Angular 2 with TypeScript

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ANIL SINGH

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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