AngularJS to Angular Migration – Why it’s High Time?

For the last few years, the migration from AngularJS to the newer versions of Angular has been one of the hottest topics in the business and tech communities. In general, most people understand that the newer, the better because it at least considers the modern-day standards. However, there are still many concerns about upgrading applications to Angular 2+ among CTOs and business owners. Is it just a market trend, or indeed beneficial? How much time will it take? Will it require significant investments?

We are a business too, and we know that such concerns are inevitable, since every business decision should be well-informed and rational. At the same time, as professional developers, we can see all the benefits the migration from AngularJS to Angular 2+ may bring to a company.

In this article, our web app developers will explain how exactly AngularJS differs from other versions of Angular and outline the main advantages of the Angular latest versions. On top of that, we’ll provide you with some recommendations on upgrading applications to Angular 2+.

Difference between AngularJS and Angular

As we see from the practice, not everyone knows where all the hustle comes from. So let’s start with brief background information, so you can take the bird’s eye view of a subject.

AngularJS

AngularJS is a JavaScript framework that is used for building the front end of web applications. It was created by Google in 2009, but the initial release took place only three years later, in 2012. AngularJS is also sometimes referred to as Angular 1.x or Angular.js, and it covers all versions of the framework which appeared before Angular 2.

Nowadays, AngularJS code is one of the most popular open-source web development technologies worldwide. According to Built With, more than 3 million websites are powered by Angular 1.x. And it’s no wonder because this framework is widely used by both large enterprises and small or medium-sized businesses.

Why is it so? Well, AngularJS allows for the fast creation of dynamic interfaces. This is because the main idea behind this framework was to use declarative programming for building the front-end of web applications.

In addition, it uses HTML as a template language, meaning that AngularJS components support HTML attributes, extends them with directives, and bind data to HTML with expressions. As a result, it creates a readable and highly expressive environment that is quick to develop.

Angular

Angular component (or Angular 2+) refers to Angular 2 and all subsequent versions. All of them are TypeScript-based platforms for web app development. Like the AngularJS app, Angular material was created and is still maintained by Google. The initial release took place in September 2016 and is considered the evolution of AngularJS.

You may wonder why the difference between the initial version of the framework and versions 2 and up is so essential. The main reason why AngularJS components require significant improvements lies in the necessity to enhance the performance of web applications. The code was rewritten from scratch, so the two technologies have very little in common.

AngularJS components vs Angular component comparison

Advantages of Angular over AngularJS

The above table contains a lot of technical information, and the benefits of Angular 2+ might not be that straightforward. So let’s take a closer look at how the migration from AngularJS to Angular 2+ will enhance your application.

Boost in performance

In general, AngularJS is a good framework since it indeed reduced the development time. However, with the AngularJS app, when there is a lot of processing on the client side, the dynamic web pages load can take plenty of time.

The main reason is that this framework was created mainly for web designers and, thus, it is not that good at meeting programmers’ requirements. Reportedly, the Angular framework offers a five-time higher speed than the AngularJS application, and that is quite a considerable improvement.

Mobile-driven approach

Angular allows developers to build lightweight applications that may be downloaded faster. One of the main reasons is that the Angular version uses so-called lazy scripting. This means that it loads particular modules only when they are needed. On top of that, some packages (for example, animations) were removed from the main Angular core. This enabled lighter and faster performance.

Maintainability

As mentioned, Angular has a component-based architecture. Such a system is much more beneficial than the one used in the initial version, i.e. MVC. In short, a component is a separate piece of a user interface that covers one small feature. For instance, chats and friend lists are different components within the Facebook UI.

Although components co-exist within one space, they are independent of each other, have their own methods, structures, and APIs. This means that it’s easier for programmers (and most likely cheaper for companies) to update applications by swapping specific components in and out.

In addition, components are reusable. Hence, programmers can reduce the time needed to extend an application by reusing the existing components in the further development cycles.

Code optimization

Unlike AngularJS application, which uses JavaScript code, Angular 2x is based on a TypeScript language. The latter is a superset of ECMAScript 6 (ES6) and it has an advanced type-checking feature. This means that most mistakes can be noticed before transpiring. Hence, developers can build large Angular apps and avoid runtime errors.

Reduced development time and costs

We have already mentioned that programmers can build a web application faster with Angular. But we think it’s worth discussing this benefit in greater detail as well, so you can capture all important aspects. AngularJS doesn’t have a CLI and only third-party tools are available.

At the same time, the latest version of Angular has an official CLI as well as other tools such as text editors, IDEs, etc. Thanks to them, developers can build an Angular app from the ground up faster and easier.

As a rule, a reduced development time also means fewer costs, since programmers usually charge on a per-hour basis for their work. On top of that, maintenance of an application that is based on Angular will likely be cheaper because there are much more software engineers specializing in this technology and in general their rates are lower.

Better support

How to do the migration right

Although the migration process might be associated with some fundamental changes, it’s not as daunting as it may seem to many CTOs and business owners. Here are some tips that will help you transit painlessly, ensuring efficient development for the Angular team of developers.

Make a TypeScript module integration beforehand

Provide migration process smoothly

Follow the Angular migration guide

Conclusion

The migration from AngularJS to the Angular module is indeed a big step that requires much effort. However, there must be no doubts about whether you should do it or not.