Introduction to Build a Modern Angular Application with Signals

Course Introduction

Project Architecture Build a Modern Angular Application with Signals

Project Architecture

This module initiates your journey by highlighting the significance of lightweight dependencies, improved reactivity, and optimized performance in application development using Angular 17. Understand the reasons driving the upgrade from previous Angular versions to Angular 17.

Introduction

Getting started with the concept of signals

The Concept of Signals

The importance of Signals over Change Detection and Zone.js

In this lesson, you will learn how to create our first Signals variable in Angular. You get to see how easy it is to declare variables compared to doing it with Observables which has a more robust boilerplate code.

How to Create a Signal

Here, you will get to learn about the different Reactive primitives available in Signals, which are writable signals, computed and effects.

Reactive Primitives in Signals

Discover the foundational concept of Signals within Angular and its relevance in the ecosystem. Understand the pivotal role Signals play, addressing performance concerns and simplifying Angular application development.

 Getting Started with Signals

This video provides an insight into what we are going to do in this module.

Module 3 Introduction

In this module, you’ll learn how to combine RxJS and Signals when working with HTTP requests from the REST API. We will learn how to work with the Interoperability API when dealing with asynchronous operations in Signals.

Fetching Data from the Server using RxJS

Here we get to modify the code we wrote previously to fetch data from the server. We go ahead to show the simplicity of Signals by converting the data gotten from the Observable into Signals making use of the Interoperability API.

Using the Interoperability API to convert Http requests to Signals

Combine RxJS and Signals to navigate HTTP requests from REST APIs. Learn to leverage the Interoperability API for managing asynchronous operations within Signals.

Signals and Http Requests

Module 4 Introduction

In this module, we get to display how to spread data across different components with the use of Signals.

Adding Items to the Shopping Cart

In this module, we will utilise Signals to increase and decrease the number of items to add to cart =, as well as integrate functionality to remove an item from cart.

Integrate Counter Functionality and Remove Items from Cart

In this lesson, we get a summary of all the items that have been added to the cart, which includes the number of items bought and the cart total.

Implement the Checkout Page

Exercise

In this lesson, we will take a look at how to handle errors in Signals.

Error Handling in Signals

Explore the techniques of disseminating data across various components using Signals, facilitating efficient communication and data exchange.

Sharing Data Between Different Components with Signals

We will do a review of all the concepts learned in the course and also look at the upcoming features to be integrated into Signals.

Wrapping up the Course

In the final module, we comprehensively review every concept that's been covered in this course. Additionally, this module provides insights into upcoming features to be integrated into Angular 17 Signals.

Course Wrap Up

### How The Course Works:

- The "Build a Modern Web Application using Angular Signals" course is a comprehensive online program spanning five modules. Discover how to effectively utilize Signals to manage the entire state of an Angular application, integrate the newly built-in control flows, employ deferrable views, navigate components using lazy loaded routes, and implement Standalone components.
- Remote Access: Take advantage of the course from any location, allowing you the flexibility to engage with the materials at your convenience.
- Self-Paced Learning: Tailor your learning experience to your schedule, enabling you to progress through the course content at your own pace.
- Community Engagement: Collaborate and learn alongside a diverse community of fellow students, fostering an environment of shared knowledge and support.
- Structured Learning: Experience a well-organized curriculum designed to provide a cohesive and comprehensive understanding of Angular Signals in a logical progression.

### Understanding the Challenges

Learning Angular 17 can present various hurdles and frustrations for those new to the technology. As individuals navigate their journey into this advanced framework, they commonly encounter several challenges:

- Complexity Barrier: The intricate architecture and extensive feature set of Angular 17 can overwhelm newcomers, posing a significant learning curve.
- State Management Complexity: Managing the state of an Angular application efficiently, especially with the nuances of Signals, can prove challenging for learners.
- Integration Puzzles: Integrating and harnessing newly built-in control flows, deferrable views, Standalone components, and lazy loaded routes can be intricate and perplexing.
- Navigational Complexity: Understanding the intricacies of lazy loaded routes and effective navigation between components can pose obstacles to a smooth learning experience.

Navigating through these complexities without guidance can hinder the progress of aspiring developers aiming to master Angular 17.


### Advantages of Learning Angular 17 in 2023

- Enhanced Performance: In 2023, Angular 17 offers optimized performance enhancements, enabling you to craft high-performing web applications capable of meeting modern user expectations.
- Cutting-Edge Features: Stay ahead in the web development landscape by mastering the latest built-in control flows, deferrable views, and other advanced functionalities unique to Angular 17.
- Industry Relevance: With Angular continuing to be a sought-after framework in the industry, mastering Angular 17 ensures you remain competitive and relevant in the job market.
- Improved Developer Experience: Angular 17 introduces refinements and enhancements that streamline the development process, providing a more efficient and enjoyable experience for developers.
- Scalability and Maintainability: Learning Angular 17 equips you with the knowledge to build scalable and maintainable applications, crucial factors in modern software development.

### Why Learn Angular 17 in 2023

Angular 17 stands at the forefront of web development frameworks in the current year, offering you several compelling reasons to dive into its intricacies:
Embrace the evolution of web development by mastering Angular 17 in 2023. This advanced version presents you with enhanced performance capabilities, cutting-edge features, and improved developer experiences. Remaining proficient in Angular ensures your relevance in a competitive industry, equipping you with the skills necessary to build scalable, high-performing applications that meet the demands of modern users.

### Course Content Overview

Course Overview:
Total Modules: **5**
Total Lessons: **12**
Total Video Runtime: **1 hour, 41 minutes**

### Summary:
This course is structured into five comprehensive modules, guiding you through the intricacies of Angular 17 Signals. From laying the groundwork with introductory concepts to diving deep into handling HTTP requests, sharing data between components, and culminating with a thorough review in the conclusion module, each section builds upon the last, empowering you to master Angular 17 Signals effectively.

Learn how to surgically manage state and optimize UI rendering with Angular Signals. This course introduces students to the world of Angular Signals, from reactive primitives to seamless interoperability between observables and signals. By the end of this course, you'll have learned how to build a highly performant, lightweight Angular application that features deferrable views, lazy loaded routes, and a PayPal-powered checkout flow. Additionally, you'll have learned the techniques needed to modernize older Angular applications so that they're able to fully leverage the power of Angular Signals.

Demystifying Reactivity with Angular Signals

Fetch data from a REST API making use of Signals.

Make use signals to add functionalities to the shopping cart

Checkout selected items from the cart using the available Signal APIs

How to manage state in an Angular application by making use of Signals

The importance of using Signals to enhance change detection

How to integrate a robust lazy loading approach, by making use of deferrable views and lazy loaded routes

Difference between using RxJS and Signals when working with data and asynchronous operations

How to structure an Angular application using Standalone components

How to work with the newly built-in control flows

Understanding the Importance of Signals Over Change Detection and Zone.js in Angular Applications

This article delves deeper into the fundamental concepts of signals and their significance in the Angular ecosystem. The focus is on the advantages of signals over change detection and Zone.js, a library used in Angular. Understanding these concepts is key to enhancing the performance, productivity, and application size of Angular projects.

Signals have several advantages over change detection and Zone.js in Angular applications, including performance, application size, and productivity.

In Angular applications, the default strategy for change detection is to execute changes across all components to ensure the Document Object Model (DOM) reflects the most recent updates. While this strategy ensures accuracy, it can negatively affect the application's performance as it requires re-rendering of the entire component tree.

 enable precise detection of changes within the component tree, allowing these changes to be reflected without the need for re-rendering the entire component tree.

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# Understanding the Importance of Signals Over Change Detection and Zone.js in Angular Applications

## Introduction

This article delves deeper into the fundamental concepts of signals and their significance in the Angular ecosystem. The focus is on the advantages of signals over change detection and Zone.js, a library used in Angular. Understanding these concepts is key to enhancing the performance, productivity, and application size of Angular projects.

## The Importance of Signals

Signals have several advantages over change detection and Zone.js in Angular applications, including performance, application size, and productivity.

### Performance

In Angular applications, the default strategy for change detection is to execute changes across all components to ensure the Document Object Model (DOM) reflects the most recent updates. While this strategy ensures accuracy, it can negatively affect the application's performance as it requires re-rendering of the entire component tree.

deji adesoga

Now that we've understood the concepts of signals and why it's necessary for

angular ecosystem, let's now go a step further, by looking at the importance of

The first importance I want to look at is performance.

With change detection, the default strategy of an angular application is to

throughout the components or any major changes.

So, as to ensure that the documents object model, also known

This strategy has a negative effect on the performance of an angular

In comparison, making use of signals, we're able to detect where changes occur

in the components tree and reflect those changes without re-rendering the

Another important thing about signals over zone.js as well as change detection

With change detection, which utilizes the library called zone.js, the library

increases the overall bundle size of the angular application.

In comparison to this, making use of signals, we are able to build a zone-less

which is much more lightweight without the need to make use of zone.js library.

The final importance I want to make mention of is productivity.

Over time, the productivity of developers working on large applications will

at some point as the application continues to grow due to the zone.js library

reload the application from the component root.

The time begins to refresh the entire application on over time and leads to

In comparison to this, with signals which provides a new way of detecting

and makes do without the zone.js library, productivity will automatically

I think with these few points, we can see the major importance of signals over

And with this, you can now move on to the next lesson of this module.