Learn Angular, MVC Core, EF Core, SQL Server Step By Step: 2020

ANGULAR CLI

14th Day

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Angular is a framework that is used to create web application. Angular uses typescript to write our business logic and method but browser does not understand typescript. The browser understand JavaScript . so that's why Angular CLI come into picture.

Angular CLI is a command-line interface tool that use to initialize, develop, scaffold and maintain Angular application directly from a command shell. It help us to create projects easily and quickly.

Run given command to Install Angular CLI ,Project creation, and compile on VS Code.

To check Angular CLI is installed or not run "ng version" on VS Code Terminal.
Create new project using command " ng new project_name" after completion.
node_modules: The node_module directory is only for build tools. That packege.json file in the app root defines what libraries will be installed into node_module when you run npm install
src : Which contain the main code files related to our angular application

app Folder: The app folder contains the files, you have created for app components.
app.component.css : This file contains the cascading style sheets code for your app components.
app.component.html: This file contains the html file related to app component.
app.component.ts: This is most important typescript file which includes the view logic behind the component.
app.module.ts: This is also a typescript file which includes all the dependencies for the website. This file is used define the needed module to be imported.

angular.json : It is very important configuration file related to your angular application.
packege.json : This is npm configuration file. It includes details about your website's package dependencies along with details about your own website being a package itself.
packege-lock.json :This is an auto-generated and modified file that gets updated whenever npm does an operation related to node modules or package.json.
tsconfig.app.json : This is used to override the tsconfig.json file with app specific configurations.
tsconfig.json :This is typescript compiler configuration file.
tsconfig.spec.json :This overrides the tsconfig.json file with app specific unit test configuration.

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ANGULAR JS

13th Day

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Q. What is Angular? .

Angular is an application design framework and development platform for creating efficient and sophisticated single-page apps.
Angular is a binding framework.it helps you to bind angular model.
Angular JS is an open source JavaScript framework that is used to build web applications. It can be freely used, changed and shared by anyone.
Angular or Angular JS is developed by Google.
It is an excellent framework for building single phase applications and line of business applications.
Our AngularJS tutorial includes all topics of AngularJS such as MVC, expressions, directives, controllers, modules, scopes .

Angular JS MVC :

MVC stands for Model View Controller.
It is a software design pattern for developing web applications.
It is very popular because it isolates the application logic from the user interface layer and supports separation of concerns.
The MVC abstraction can be graphically represented as follows.

A Model View Controller pattern is made up of the following three parts:
Model: It is responsible for managing application data. It responds to the requests from view and to the instructions from controller to update itself.
// Object creating for Customer
var Customerobj = new Customer();
View: It is responsible for displaying all data or only a portion of data to the users. This is the view coding.
Name :<input type "text"name="" onchange= "CustomerUIBinder()" id="txtName"><br>
Address :-<input type "text"name="" onchange= "CustomerUIBinder()" id="txtAddress"><br>
<input type ="button"value="Save" onclick="Save()"/>
Controller: It is responsible to control the relation between models and views. It responds to user input and performs interactions on the data model objects.
   //this function will connect to code of class and UI code
      function CustomerUIBinder(){
         Customerobj.name = document.getElementById("txtName").value;
         Customerobj.address = document.getElementById("txtAddress").value;
      }
Angular is given something is called as Directives.

Directives: It is change to HTML behaviour.

AngularJS directives are extended HTML attributes with the prefix ng-.
The ng-app directive initializes an AngularJS application.
The ng-init directive initializes application data.
The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.

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Abstract Classes , Need of Interfaces and its Differences

12th Day

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ABSTACT CLASSES :

A TypeScript Abstract class is a class which may have some unimplemented methods. These methods are called abstract methods. We can't create an instance of an abstract class. But other classes can derived from abstract class and reuse the functionality of base class.
SYNTAX:

export abstract class Employee

{ // This is the half defined parent class

       name:string ="";
       designation:string ="";
       abstract Dowork();
     }

 Explanation: In above ,We have created an abstract class Employee. And first 
 method Dowork is an abstract and we have used abstract keyword before the method .
 Semantically, Abstract class means half define parents class and we can also say that Employee class is a  generalization class but not in all conditions. 
Remember that, Parent class and generalization class has some difference, it has not each and every condition same. 
 In some parent classes has all method  implemented and  it has not any half define class in that case it is not a generalization class.

    Derived Class: It is also called specialization class  or concrete class because 
        any method which is abstract class should be implemented by the concrete class.

    export class Manager extends Employee
     { // This is the child class
       Dowork()
       {
         console.log("Managing People");
       }
     }
    export class Lead extends Employee
     { // This is the extended class
         Dowork()
        {
          console.log("Helps people Technically");
        }
     }
     
  Explanation: In above example, We have created Manager and Lead 
  concrete classes or specialization classes. And each and every classes 
 has its own work. Suppose by mistake we have not defined concrete classes work,
 then it will show error.
Concrete/specialization class means child class.

INTERFACE:

Interface has such type of properties which can not provide any type of implementation but we can define its properties and function only.
Impact Analysis means whenever we change only one places then you will have to change many places.
SYNTAX:

export interface IEmployee

      {
        work();

      }
   
  In above example, we have defined an interface IEmployee. We have implemented IEmployee interface in Employee class by using 'implements' keyword after class name.If we try to differ the data types of properties or signature of method from IEmployee interface in Employee class, then TypeScript compiler will throw an error.

NEED OF INTERFACES AND ITS DIFFERENCES

INTERFACE	ABSTRACT
1. In Interface, all members are abstract.	· But in this case its some members are abstract and some are fully implemented.
2. Interface supports multiple inheritances.	· But abstract class does not support multiple inheritances.
3. Interface is a CONTRACT, LEGAL<, ENFORCEMENT -> impact analysis.	· Abstract class is a half define parent class
4. TypeScript Interface has zero JavaScript code.	· But abstract class compile to JavaScript function.

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INHERITANCE AND CONSTUCTOR CONCEPTS

10th Day

Hey Guys ,I hope that you are enjoying with my blogs writing and today's we

will cover some concepts:

INHERITANCE :

Inheritance is an aspect of OOPs languages.
which provides the ability of a program to create a new class from an existing class.
The class whose members are inherited is called the base class, and the class that inherits those members is called the derived/child/subclass. In child class, we can override or modify the behaviors of its parent class.
Syntax:

Parent class :

class <Class_name>

{

// methods and fields

}

Example:

Child class:

class sub_class_name extends super_class_name
{
// methods and fields
{

Example:

We can use it for Code Reusability.
We can use it for Method Overriding.
This is called IS RELATIONSHIP i.e. Customer IS A CHILD OF Lead.

Using import and export method we have created parent-child relationship.
Example:

TYPES OF INHERITANCE:

Single Inheritance: it can inherit properties and behavior from at most one parent class.
Multilevel Inheritance: In this case a derived class is derived from another derived class.
Multiple Inheritance :When an object or class inherits the characteristics and features form more than one parent class.
Hierarchical Inheritance: In this case, More than one subclass is inherited from a single base class.
Hybrid Inheritance: In this case, A class inherits the characteristics and features from more than one form of inheritance.

CONSTRUCTOR:

A Constructor is a special type of function of typescript class and it will be automatically invoked when the first object of class is created.
TypeScript only allows one constructor implementation.
Suppose, In above Example we have required default values like address or anything.
For Example: We have created two class Lead & Customer in Customer.ts .
Customer.ts:

Now here ,we have created Client.ts which will invoke Customer and Lead class :

After Compilation: Using tsc -- init

So here tsconfig.json file has been created successfully like Example:

Just Run Client.js file through teminal: node Client.js address will give as output.

Suppose if it has constructor in parent class then first fire it.

Access Modifiers public private and protected : :

Public: It is accessible outside or anywhere the class.
Private: it is only accessible inside the class.
Protected: It is only accessible in inherited classes and own classes we can't access outside.

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TSCONFIG FILE

9th Day

Hey Guys, I hope that you are also enjoying with my blogs and today's we will study about :

VARIABLE DECLARATION:

Syntax: Var [identifier]:[type-annotation]=value;
For Example: we can write like
var name:string = ”Raushan”
var name:string; //The variable is a string variable
var name = ”Raushan” //The variable’s type is inferred from the data type.
var name; // Its value is set to undefined by default

CREATING CLASS:

Class is blueprint for creating objects as well as custom data type.
Syntax : Class Class_Name { // Class Scope }
For Example: Class Customer{

// Customer is a Class Name

}

CREATING OBJECT

To create an instance of the class, use the new keyword.
Syntax ::Var object_name = new class_name([argument])
For Example:
With the help of Cust1.name="Raushan"; we use this instance.

EXPORT AND IMPORT

We have created a file of TypeScript in Vs Code : Customerfile.ts

Input:

Explanation: Above in given code, we have created class, name Customer.
And also created its object like Cust1 & Cust2 .
We have also used with the help of Cust1.name="Raushan";
Similarly ,Address of this Customer filename has created like:

For Importing and Exporting Purpose:

We are importing Customerfile:
import { className of Addressfile } from "./Filename of Addressfile"
For Example: import{ Address} from "./Addressfile" like as:
For Exporting to Addressfile: export Class Address like as:
IMPORTANT POINTS:
In Single Address file, We can have multiple address classes.
We have two files which has above mentioned so we will compile it with the help of terminals.
First we will compile Addressfile and then Customerfile like as:
But Suppose in project has more files then instead of use tsc in each file we can make TS CONFIG FILE. Through command: tsc --init
For Example:

tscconfig.jsonfile created successfully.

JSON: it means JavaScript object Notation. It is a format which data represeted using curly braces. For Example: for single Purpose
{ "name":"Raushan","Address":"Kolhapur"}

For more data we can use :[ { "name":"Raushan","Address":"Kolhapur"}, { "name":"Manjhi","Address":"Kolhapur"}]

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TYPESCRIPT

8th Day

Hey Guys, I'm very glad to share with you, We have already studied about VS CODE,

NODE JS, NPM . And today's we are going to study about TYPESCRIPT.

This concept is very important to start the Angular.

TYPESCRIPT

Whole Angular has made in typescript.
TypeScript is an open-source language which builds on JavaScript, one of the world’s most used tools. i.e. Any browser, any OS, anywhere JavaScript runs. Entirely Open Source.
TypeScript extends JavaScript by adding types.

Basic comparison between JavaScript and TypeScript

TypeScript is known as Object oriented programming language whereas JavaScript is a scripting language.
TypeScript has a feature known as Static typing but JavaScript does not have this feature.

In case of TypeScript,
Var x =0; // TS compiler will treat as number. But when we assign like x="Raushan" it will show error like:

Important Points:

TypeScript extends JavaScript and makes it strongly typed.
Strongly typed means while we write the code the data typed checked.
Advantages during development phase errors and issues will be caught.
This is the TypeScript Code:

But to execute this code we will have to be convert it into JS with VS Code terminal like
Command : tsc file.ts . It will look like:

TypeScript translates/ transpiles /convert to JavaScript.
All JavaScript Code are valid for TypeScript code. For Example: alert("Hello"); .
TypeScript is known as Object oriented programming language.
TypeScript gives you benefit OOP, Classes,==> Closures and IIFE.
For Example:
In JS code it will convert like: Closure
Using Inheritance Concepts:
Its JS Code will be:

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