Angular is an application design and development framework for creating quality SPAs and the higher versions are capable of creating complex applications. Angular is a framework created by Google. Mostly, developers use it to build client-side applications. It is a platform that enables you to combine declarative templates, dependency injection, end-to-end tooling, and to solve development challenges with integrated practices.
All versions of Angular use dependency injection. Injection of DI is used in various link functions, controller functions, directive definitions, and on the other hand Angular implements a hierarchical dependency injection system using basic functionalities like declarations, constructor functions, and providers.
There are several interface elements independent of each other, offering you several benefits, including Reusability, Simplified Testing, Improved Readability, Ease of Maintenance, etc.
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One has to choose between versions to use Angular in Web Application – Angular JS or other. The higher versions of Angular are referred to as Angular 2+ as there were many upgrades.
TypeScript is a superset of ES6. The new version is backward compatible with ES5 and thus Angular also has the benefits of lambda operators, iterators or reflection's mechanism of ES6. AngularJS comes with scope and controller. Variables have scope to be added with other variables that will be visible in View and Controller. While Angular does not have a scope or controllers. It uses a hierarchy of components. Components are directives with predefined templates.
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1) Structure and Architecture:
AJS supports MVC (Model View Controller). Angular operates to get the required output. AngularJS generates the pipelines that transform values into Angular templates.
2) Built-in Typescript:
TypeScript allows static typing in the development. It does not just improve performances but also clears runtime errors that made AJS incapable to be used in applications that are complex.
3) Angular Command Line Interface
Angular 2+ works with their CLI. CLI plays a crucial role as it helps in completing projects fast and is helpful for services, generating components, and much more. AngularJS has no CLI support.
4) Expression of Syntax:
For data related works like binding and collecting Angular is comparatively more intuitive and interactive than AngularJS. () is used for event binding and  is used for property binding in Angular. Whereas a JS developer has to remember the working ng directive.
The upgrades come with improved efficiency if not new features. So, the higher versions of Angular are faster and easy to use than AngularJS. Developers believe that correctly developed applications in Angular can be 5X faster than the applications built in AngularJS.
As mentioned above the two way binding, the feature which made AngularJS famous is good with SPAs (Single Page Applications). But for complex applications, it is undoing. AngularJS checks variables by a digest cycle. This cycle is randomly generated and thus the/code/program expands impacting the application's output and performance. Contrary to that, Angular is based on a flux architecture, which makes applications much faster, where detection is changed through the unidirectional data flow.
6)Mobile Application :
Angular 2+ versions support Mobile development while AngularJS doesn’t. This property limits the use of AngularJS. In the current scenario, the development of mobile applications is increasing and AngularJs is an antediluvian in the era of mobile computing.
There are other factors apart from the above mentioned which proves one a good choice and vice versa. The features of Angular, unlike AJS, are self-sufficient and independent which is the reason why they are easy to test and ensure reusability. There are in-built extensions that help with server-side loading and rendering which allows developers to synchronize both, server and client content and aids much to SEO. These are some the advantages of Angular or AngularJS
There are flaws of Angular such as a steep learning curve and hard for you to learn in TypeScript on a quick note. With the arrival of frameworks, developers like quick development. They don’t work well with statically and long typed languages. The components of the Angular are hard to manage and are very complex. The incomplete documentation is the regular complaint of developers and engineers.
Looking at the number of advantages, Angular might make sense to you. But you must remember the point about the learning curve of Angular. Well, choosing with the versions of Angular you might pick the latest one but if you possess a fair, single page or simple application AngularJS can be a smart choice for you to work with. For a complex and scalable application with more features, it is likely to go with the latest version of Angular.
There is a company named Angular Development. Here, you can get some good developers. Learning and using Angular is the right decision.
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AngularJS is the first version and then the rest of the naming started with Angular 2. This led to confusion among the developers as Angular 2 was a rewrite of AngularJS. To solve the confusion, the Angular Team announced separate terms that should be used for each framework. The versions of AngularJS will be referred to as 1.x.x. and of Angular without "JS" referring to version 2 and so on.
There was an angular router with the version 3.x. Now releasing Angular with version 3 will create confusion with its router 4 and other upgrades. To avoid this confusion Google's Igor Minar said at the NG-BE 2016 conference that Google will skip Angular version 3 and name the next upgrade as Angular 4. That will correlate with the router planned for the usage along with the release.
Angular 4 is backward compatible with version 2 which is a typescript based open-source and front-end app development framework. The final version after few upgrades of Angular 4 was released on March 23, 2017
It was not a complete rewrite there were three major changes to it:
● Introducing HTTPClient, an easier, smaller, and more powerful library for making HTTP Requests.
● Feature to disable animation on conditions
● New router life cycle events joining the life cycle event such as Navigation start. Four new events like GuardsCheckStart, Guardschecked, ResolveStart, resolved.
The above are the features of Angular 4.3.
This was more advanced and enhanced with more features than the previous upgrades. To remove dead or unnecessary codes from their applications is one of the best features of Angular 5. Other than that the support of progressive web apps, a built optimizer and improvements related to design, code-sharing, less time for assembling dynamic web applications, and so on. Also, it has DOM support which helps the compiler with incremental compilation. This version was launched on November 1, 2017.
The improvements were better than Angular 5. The major focus was on the toolchain and making it more compatible and easier to move quickly with Angular. Angular 6 was developed to prefer web parts that are a part of mostly cutting-edge web browsers. The component of the Angular Web can be used in various HTML pages.
The ng update, add, Angular Elements, AMSC (Angular Material Starter Components), Command Line Interface Workspaces, Library support, Angular Material + CDK Components, Tree Shakeable Providers, and RxJS v6. It was released on May 4, 2018
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There were major upgrades on Application Performance, Angular Material & Component Dev Kit (CDK), Virtual Scrolling, Improved Accessibility and dealing with Selects, also the support of Content Projection using web standard for custom elements. There were some dependency updates regarding Typescript 3.1, RxJS 6.3. Node 10 along with the support of Node 8. Angular 7 was released on October 18, 2018.
Angular 8 featured different loading and handling for all application code, TypeScript 3.4 Support, Angular Ivy as a preview (opt-in preview), Dynamic imports for lazy routes, web workers. Angular 8's Ivy opt-in previews include:
● Generation of code which is easy to read and debug at Runtime.
● Faster rebuild time
● Improved template type checking
● Backward Compatibility.
Angular 8 was released on May 28, 2019.
The latest version so far is Angular 9, released on February 6, 2020. It moves all the applications to use (by default) the Ivy compiler at runtime. There were upgrades with TypeScript 3.6 and 3.7. Also for better quality output and dropping minor errors, there were hundreds of bug fixes and the Ivy compiler during compilation and runtime offers several other advantages:
● Improved CSS classes and style compatibility, features and binding
● Updated type checking
● Smaller sizer of the bundle
● Faster Testing
● Faster and Better Debugging
● Improved Build Errors
● Updated build times, and enabling AOT on by default
● Improved Internationalisation.
Since the release of Angular 9, the team has moved all new applications and will improve bundle sizes and development speeds.
We have discussed Frameworks, the use of it, Introduction and Versions of Angular, Difference between AngularJS and Angular 2+. Features of different versions of Angular. Hopefully, you've got the overall idea of the Angular Framework.
Angular is a great framework and it will have many improvements making it an obvious option for developing web applications.
For the long term support (LTS) for Angular, Google has further positioned it with the scalable and resource-intensive projects.