AngularJS was released in 2010 by Google. Normally AngularJS is also referred as Angular1 by some people. So AngularJS is of version Angular 1.x. This is the only version of AngularJS. Everything was fine but development of ReactJS and its large impact on the world and also the fact it was from Facebook was quite intense. It led to competition between frameworks from two renowned companies.
Then team developed Angular3 but it was skipped and Angular4 was introduced. Angular4 was introduced in 2017 which introduced some new features like Universal Project. Unlike AngularJS and Angular2, Angular4 is compatible with Angular2. This means it is a improved version of Angular2 and not a re-write. Angular4 provides many enhancements in comparison to Angular2. Some of these enhancements are inbuilt Animation Package, ngTemplate,Form Validator attributes , titlecase pipe etc.
Then Angular5 was released but it was just updated version of Angular4. It has a bunch of additional features and bug fixes like Build Optimizer, HttpClient etc.
Angular6 is the latest version of angular which was released in 2018. It focuses more on toolchain like with Angular in the future, like: ngAngular Elements, CLI Workspaces, Library Support, Angular Material Starter Components. So these are versions of Angular till date. Angular6 is much faster to its previous versions as it is using Ivy Rendered which is a rendering engine.
The Angular 7 is escalated between Angular core frameworks, Angular Material a CLI. Angular CLI has now a convenient guide to walk through the creation of the applications. Angular 7 also introduced the concept of the “Bundle Budget” which helps in reducing the bundle size of an Angular app. Angular Material is a UI toolkit, which has modernized the homepage for guidance related to design, components and tooling around for building better user experiences. Angular CDK provides virtual scrolling capabilities with a drag & drop framework.
Advantages Of using Angular –
- Two-way data binding – AngularJS was built with Model-View-Controller architecture. And the framework synchronized the Model and the View. As the data in the Model changes, the View does too. Two-way data binding allowed engineers to reduce development time as it didn’t require writing additional code to provide continual View and Model synchronization.
- Directives – This feature actually enabled the HTML extension mentioned above. Directives allowed developers to assign special behaviors to the Document Object Model (DOM), permitting engineers to create dynamic and rich content with HTML.
- Dependency injection – Dependencies define how different pieces of code interact with each other and how the changes in one component impact the other ones. Usually, dependencies are directly defined in components themselves. So that every change in dependency requires changing components as well. With AngularJS, you could use injectors that defined dependencies as external elements decoupling components from their dependencies. Dependency injection made components more reusable, easier to manage and test.
- Community – Right from the beginning, AngularJS became extremely popular among engineers. A strong community provided enough training materials, discussions, and third-party tools to embark on using AngularJS as well as find a solution to nearly every arising issue.
Newer versions of angular i.e. Angular 2 plus has components based design as compared to angular 1 which followed MVC flow. Components based architecture provides high reusability of components across the Application.
- Great performance – Angular2 – doesn’t do deep object comparison. If items are added/removed to/from an array, change detection won’t detect it. The same for object properties as long as they are not directly bound from the view.
- Reusability – Components of a similar nature are well encapsulated, in other words, self-sufficient. Developers can reuse them across different parts of an application. This is particularly useful in enterprise-scope applications where different systems converge but may have many similar elements like search boxes, date pickers, sorting lists, etc.
- Readability – Encapsulation also ensures that new developers – who’ve been recently on boarded to a project – can read code better and eventually reach their plateau of productivity faster.
- Unit Test Friendly – The independent nature of components simplifies unit tests, quality assurance procedures aimed at verifying the performance of the smallest parts of the application units.
- Maintainability – Components that are easily decoupled from each other can be easily replaced with better implementations. Basically, your engineering team will be more efficient in maintaining and updating the code within the iterative development workflow.
- Usage of Typescript – The biggest selling point of TypeScript is tooling. It provides advanced autocompletion, navigation, and refactoring. Having such tools is almost a requirement for large projects.