Difference Between Angular 2 and Angular 4

Angular, developed and maintained by Google, is a popular open-source web application framework. It has seen significant advancements since its initial release, with each version bringing new features, enhancements, and improvements. Two noteworthy versions in this evolution are Angular 2 and Angular 4. In this article, we’ll explore what Angular 2 and Angular 4 are, highlight their differences, and provide a comparison table for a quick reference.

What is Angular 2?

Angular 2 marked a major shift from its predecessor, AngularJS. Released in September 2016, Angular 2 was a complete rewrite of the original AngularJS, designed with modern web development practices in mind. Key features of Angular 2 included:

  1. Component-Based Architecture:
    • Angular 2 introduced a component-based architecture, making it easier to manage and organize code. Applications were built by composing components, each representing a specific part of the user interface.
  2. TypeScript Integration:
    • Angular 2 embraced TypeScript, a superset of JavaScript that adds static typing. This allowed for better tooling, code completion, and improved maintainability.
  3. Enhanced Performance:
    • The change detection mechanism in Angular 2 was optimized for improved performance, making applications faster and more responsive.

What is Angular 4?

Angular 4, released in March 2017, followed shortly after Angular 2 and retained many of its core principles while introducing several enhancements:

  1. Smaller and Faster:
    • Angular 4 aimed at reducing the size of generated code and improving application speed. This was achieved through various optimizations in the framework.
  2. Animation Package:
    • Angular 4 introduced a separate animation package, @angular/animations, allowing developers to use a dedicated library for animations instead of including the animation features in the core framework.
  3. ngIf and ngFor Improvements:
    • The ngIf and ngFor directives received performance improvements and added features, making it more efficient to work with conditional rendering and lists in templates.

Differences between Angular 2 and Angular 4:

  1. Size and Performance:
    • Angular 4 is generally smaller and faster than Angular 2 due to various optimizations.
  2. Animation Package:
    • Angular 4 introduced the @angular/animations package as a separate entity, while in Angular 2, animation features were part of the core framework.
  3. ngIf and ngFor Improvements:
    • Angular 4 improved the performance and functionality of ngIf and ngFor directives compared to Angular 2.

Comparison Table: Angular 2 vs Angular 4

Feature Angular 2 Angular 4
Component-Based Architecture Yes Yes
TypeScript Integration Yes Yes
Performance Improvements Yes Yes
Animation Package Core Feature Separate @angular/animations package
Size Reduction Notable size Smaller size
ngIf and ngFor Enhancements Basic functionality Improved performance and functionality


Angular 2 and Angular 4 are integral parts of the Angular framework’s evolution. While Angular 2 laid the foundation with its component-based architecture and TypeScript integration, Angular 4 refined and optimized the framework for better performance and developer experience. Choosing between the two versions depends on specific project requirements and considerations for factors like size, performance, and feature preferences. As the Angular ecosystem continues to evolve, developers can anticipate further enhancements and additions to streamline web development processes.

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