Angular is considered one of the best open-source JavaScript frameworks. Google’s Angular team released Angular 2 as a complete makeover of its original Angular 1 framework. For those of you who are still learning Angular frameworks, this blog will offer a comparison of Angular 1 (AngularJS), Angular 2, and Angular 4

Architecture

The architecture of Angular 1 is based on the Model View Controller.

Angular 2 comprises a significant change in structure as compared to Angular 1. Angular 2 is based on a Components structure, like what we see in React.js.

Angular 2 was focused on mobile apps development. Angular 4 is much faster and reduces the file generated code of components; it also allows the developer to generate code you can use in debug mode and production mode.

File Type

Angular 1 applications were built using JavaScript.

var angular1 = angular
       .module('uiroute', ['ui.router']);
angular1.controller('CarController', function ($scope) {
    $scope.CarList = ['Audi', 'BMW', 'Bugatti', 'Jaguar'];
});

Angular 2 applications were built on Typescript, which is a superset of JavaScript.

import { platformBrowserDynamic } from "@angular/platform-browser-dynamic";
import { AppModule } from "./app.module";
platformBrowserDynamic().bootstrapModule(AppModule);  
import { NgModule } from "@angular/core";  
import { BrowserModule } from "@angular/platform-browser";  
import { AppComponent } from "../app/app.component";  
@NgModule({  
    imports: [BrowserModule],  
    declarations: [AppComponent],  
    bootstrap: [AppComponent]  
})  
export class AppModule { }  
import { Component } from '@angular/core'  
@Component({  
    selector: 'app-loader',  
    template: `  

   

  
 
Welcome to Angular with ASP.NET Core and Visual Studio 2017



`  
})  
export class AppComponent{}

This complete file and code syntax change make it so hard to upgrade from Angular 1 to Angular 2. Angular 4 work on the latest version of TypeScript (2.1 and 2.2)

Code Reuse

$scope, which was featured in Angular 1, was removed from Angular 2 and Angular 4. In the newer versions of Angular, instance developers can add new directives and controls. Additionally, various component splitting features have increased code reusability.

Mobile Support

Angular 1 was made for responsive UI and two-way binding of applications. But it didn’t support mobile. Angular 2 was made with a mobile-oriented architecture. NativeScript helped make Angular 2 mobile development faster and more effective.

Starting with Angular 2, developers could create cross-platform applications with this framework.

Features and Performance

View Engine:

The view engine introduced Angular 4, which decreased the size of the generated code using the Ahead of Time (AOT) manner.

SEO Friendly:

The Angular team introduced the new, powerful Single Page Application (SPA) build to be Search Engine Optimization (SEO) friendly while rendering the HTML on the server-side.

Animation Package:

The Angular animation function required the @angular/code module, essentially creating its own package. With Angular 4, ] you don’t use an animation package, which helps to reduce the size of your code.

Smaller and Faster:

Angular 4 programs will consume less space and run faster, thus increasing the speed of your application.