React vs Angular : The Complete Comparison

React vs Angular : The Complete Comparison

Do you want to understand and discover the difference between reaction and angle? Then keep reading! I will explain in this article the similarities, differences, pros, and cons of reactions and angles.

You don’t need to be an expert programmer to understand this article, but we encourage you to familiarize yourself with JavaScript.

* Disclaimer: We have worked extensively with reactions and angels. We use angles in IBM’s work and reacted and reacted in my current work.

  • Reaction VS Angular Comparison:

The main differences between AngularJS (framework) and reaction (library) lie in the following areas: component, data binding, performance, dependency resolution, directives, and templates. Let’s look at these aspects separately.


AngularJS has a very complex and fixed structure, as it is based on three layers – model, view and controller – typical one-page application. A $scope object in AngularJS is responsible for the part of the model, which is initialized by the controller and then converted to HTML to create the user.

AngularJS provides many standard services, factories, controllers, directives and other components that will take some time for JavaScript developers to initially master.

With AngularJS, we split the application code into several files. For example, when we create a reusable component with our own directives, drivers, and templates, we have to describe each block of code in a separate file.

Once we have described our directive, we add a link to the directive to our template to dock these parts. The AngularJS directive represents the template logic of your application.

We also add drivers to provide the $scope or context needed for our model. The driver is also written in a separate file. When we modulate our application this way, we can reuse our templates or components in different parts of the site.


Facebook, the creator of the reaction, chose a different architecture of AngularJS and similar MVC frameworks. In short, applications built with reactions do not have the “right” structure.

The reaction is a great JavaScript library that helps us update the user view. But the reaction still does not allow us to create the application ourselves.

The library lacks driver models and layers. To fill the void, Facebook introduced lux and now there are many variants to control the application workflow.

Reactions provide a very simple and efficient way to build component trees. It has a functional programming style where the component definition is declarative. The composition of your application from a reactive component is like forming a JavaScript program from a function.

  • Reaction and Angular Data Link:


AngularJS connects the document object model (dom) values to data modeling using bidirectional data binding via a controller.

In short, if the user <input> interacts with the field and gives the application a new value, not only the view is updated, but also the model.

Bidirectional data binding is beneficial for AngularJS because it helps us write less repetitive code to create interaction between components (views and models) in the application. We don’t have to create a way to track changes in the app and change our JavaScript code accordingly.

Angularjs automatically creates an observer for each link. During development, we can see an application full of too many observers for link elements.


But what are the advantages of reacting to AngularJS in terms of data binding? Reactions use one-way data binding, which means we can only direct the data flow in one direction. Therefore, always delete data changes. It is worth noting that, thanks to reacting, bidirectional data binding can be used before v15.

  • Reaction and Angle performance:


As we mentioned above, angular 1.x and above is based on bidirectional data binding. The concept is based on “dirty check”, a mechanism that can make our AngularJS application lags.

When we bind values in HTML to our model, AngularJS creates an observer for each link to keep track of changes in dom.

Once the view is updated (getting “dirty”), AngularJS compares the new value with the initial (linked) value and executes the $digest loop. The $digest loop checks not only the values that are actually changed but also all other values that are tracked through the observer. That’s why performance is greatly reduced if your application has too many observers.

This disadvantage is more painful when several values (views) depend on each other. Once AngularJS sees that changing one value is triggered by a change of another value, then it stops the current $digest loop and reruns it.

the function does not stop working until it checks all observers and <input> applies all necessary changes to the views and models. In fact, we can link a field to different views and models. When a user enters new data into a field, the changes may not be immediately visible.

Another drawback of the AngularJS framework is the way it works with doms. Unlike the reaction, AngularJS applies changes to the actual dom in the browser.

When the actual dom is updated, the browser has to change many internal values to represent a new dom. This also has a negative impact on application performance.

Poor performance is the main reason Angular 2 supporters reprocess how the angle changes the status of the program. Angular 2 and newer versions of the Angular 4 framework also have the server-side rendering and one-way data binding functions similar to reactions.


Reaction creators introduced the concept of a virtual document object model, which is considered one of the greatest advantages of reaction compared to mature frameworks (including AngularJS ).

How does virtual dom work? When our HTML document is loaded, the reaction creates a lightweight dom tree of the javascript object and saves it to the server.

For example, when the user <input> enters new data into a field in the browser, the response creates a new virtual dom and compares it to the previously saved dom.

The library finds the difference between the two object models this way and reconstructs the virtual dom again, but uses the new modified HTML. All this work is done on the server, which reduces the load on the browser.

Now, instead of sending new HTML to the browser, the reaction only sends HTML for the modified elements. This method is more efficient than AngularJS provides.

As a one-way data link, the reaction does not use observers to track changes to the actual DOM. In general, the reaction makes it easier to control application performance. But that doesn’t mean we can’t create a quick app in AngularJS.

  • React vs Angular Resolving Dependencies:


AngularJS uses a basic Object Oriented Programming (OOP) pattern called dependency injection, meaning we write dependencies in a separate file. It’s inconvenient to create a dependency directly in an object. In AngularJS, dependency injection is inherent to any standard functions that we declare for an AngularJS factory or service. We only pass dependencies as parameters in any order in our functions. This is where vanilla JavaScript is different from AngularJS, as the order of arguments in standard JS is strict.


The difference between React and AngularJS with regards to dependency injection is that React doesn’t offer any concept of a built-in container for dependency injection. But this doesn’t mean we have to think of a method to inject dependencies in our React project. You can use several instruments to inject dependencies automatically in a React application. Such instruments include Browserify, RequireJS, EcmaScript 6 modules which we can use via Babel, ReactJS-di, and so on. The only challenge is to pick a tool to use.

  • Dependencies of reaction and Angle Resolution:


AngulasJS uses the basic object-oriented programming pattern (oop) called dependency injection, which means we write dependencies to a separate file. It is inconvenient to create dependencies directly on an object.

, dependency injection is inherent in any standard function we declare for AngulasJS factories or services.

We will only pass dependencies as arguments in any order in the function. This is where vanilla javascript differs from AngulasJS because the order of parameters in standard js is strict.

AngulasJS automatically finds the appropriate objects, which are injected as $routeparams, $filter, storage, and $scope parameters.

There are two functions that make dependency injection possible in the AngulasJS framework: $injection and $provision.

We should also mention the dependency injection issue in AngulasJS; you may run into a small problem when you run code minification.

The code narrator reduces the dependency name to a simplification such as $b and $y. But when executing the code, AngulasJS will look for dependencies by their actual names (i.e. $scope, $filter, and storage).

As you can see from the following example, we have declared the product function and passed only the short name of the argument. Below, we specifically show our injected functions in the necessary order. So the parameter “s” represents “$routeparams”, etc. AngulasJS will automatically find dependencies. This time, pay attention to the order of the parameters.


The difference between reaction over dependency injection and AngulasJS is that the reaction does not provide any dependency injection concept in the built-in container.

But that doesn’t mean we have to consider a way to inject dependencies into reactive projects. You can use a variety of tools to automatically inject dependencies into a reactive application. These tools include Browserify, RequireJS, ECMAScript 6 modules that we can pass Babel, ReactJS-di, etc. The only challenge is to choose a tool to use.

  • Instructions and Templates:


It is a way to organize our work/code around the dome. If you use AngulasJS, we can only access the dom through the directive.

For example, AngulasJS has many standard directives like ng-bind or ng-app, but we can also create our own directive. We should do that.

We make our own directive in AngulasJS to insert data into the template. The template must have an element that our directive is written as a property.

Properties such as template or template are easy to understand. But it is unclear how (and why) to define priority, terminal, scope, and other properties. Mastering the syntax of AngulasJS instructions can be a real challenge.

In short, to join dom elements with AngulasJS applications, we use standard and specific directives.


Reactions do not provide partitions on templates and policies or template logic. The logic of the template must be written to the template itself. To see what this looks like, open a GitHub example. You will notice the reaction of the application of the component.

todo item is created with a standard method to react.create class (). We pass an object with properties to this function.

These properties like the component date should be the component date, handle the key down or handle the commit represents the logic, which happens with our template.

At the end of the component, we usually define the render property, which is a template for rendering in the browser.

Everything is in one place and the JSX syntax in the template is easy to understand even if you don’t know how to write in JSX. It must be delivered and what information will be provided to you by the property.

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