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

Building Modern Angular Applications with Signals

Welcome to an insightful journey into building modern Angular applications with signals. This article aims to shed light on the relatively untapped potential of signals in Angular applications and guide readers to adopt this powerful concept effectively in their projects. We will explore the whys and hows of adopting signals in Angular while also highlighting the detriments of traditional state management methods. Throughout this article, we will be illustrating the points with relevant code examples to make the understanding and application of these concepts as straightforward as possible.

The introduction of Angular in 2016 brought along 

 as the primary means of managing states and sharing data. Despite their immense capabilities, these technologies have steeply escalated the learning curve for understanding Angular. This complexity is widely recognized, even acknowledged on the RxJS website.

Performance, bundle size, and productivity are other critical concerns. Before signals, Angular heavily relied on the library 

 to detect changes in an application. The downside was that even minor changes triggered the execution of changes throughout the entire component tree, negatively affecting the performance and bloating the bundle size of the application. This, in turn, reduced productivity as larger applications took longer to compile.

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# Building Modern Angular Applications with Signals

## Introduction

Welcome to an insightful journey into building modern Angular applications with signals. This article aims to shed light on the relatively untapped potential of signals in Angular applications and guide readers to adopt this powerful concept effectively in their projects. We will explore the whys and hows of adopting signals in Angular while also highlighting the detriments of traditional state management methods. Throughout this article, we will be illustrating the points with relevant code examples to make the understanding and application of these concepts as straightforward as possible.

## Why Signals?

The introduction of Angular in 2016 brought along `Observables` and `RxJS` as the primary means of managing states and sharing data. Despite their immense capabilities, these technologies have steeply escalated the learning curve for understanding Angular. This complexity is widely recognized, even acknowledged on the RxJS website.

Performance, bundle size, and productivity are other critical concerns. Before signals, Angular heavily relied on the library `zone.js` to detect changes in an application. The downside was that even minor changes triggered the execution of changes throughout the entire component tree, negatively affecting the performance and bloating the bundle size of the application. This, in turn, reduced productivity as larger applications took longer to compile.

deji adesoga

Hello everyone, welcome to build a modern angular application with signals.

I'm going to be your author for this course.

I'm a front-end engineer at Enterfive Inc.

I have five years of industry experience working with JavaScript technologies.

Earlier this year in partnership with educative.io, I created a MEAN Stack

I also write programming articles for the web.

I've written articles for publications such as freecodecamp, Dev.2, DZone

more which I can't actually remember for now.

You can also find me on youtube at youtube.com/thecodeangle.

Over on youtube, you find me creating tutorials on JavaScript technologies such

React, VueJS, NodeJS and including vanilla JavaScript.

Recently, I asked the question in one of the Angular communities I belong to if

has started using signals in their Angular project.

The answer I got was a staggering 83% saying no while only 16% of the Angular

This now brings about the next question, why do we need signals?

So the first point I'd like to highlight here is the steep learning curve.

This is the introduction of Angular in 2016.

Observables and RxJS have been the major way of managing states and sharing

Despite Observables and RxJS having huge capabilities and a well crafted design

technologies have made the learning curve required for understanding Angular a

So much so that it is admitted as a fact on the RxJS website.

Another point I'd like to highlight is performance, bundle size and

Before signals came into play, Angular relies heavily on a library called zone.js

any changes that occurs in an Angular application.

What this means in essence is that, for every minor change that occurs in an

the zone.js library would need to execute the changes throughout the entire

Which brings a negative effect on the overall performance of the Angular

also makes the bundle size of the application to be bloated.

The combination of these two effects would lead to reduced productivity as the

an application gets, the more time it requires to compile the application which

With the introduction of signals in Angular, we can now build a complete zone

that does not rely on the zone.js library to detect change which significantly

the overall performance of an Angular application as well as reducing the

Angular application due to the fact that we can now go completely zoneless.

Having said all this, the overall objective of this course is to go through 5

where we are going to make use of signals to manage the entire state of our

From declaring variables to utilizing the various APIs available in signals, we

get to witness the reactivity of signals without the use of any third party

to spread data across our Angular application.

In addition to this, we will also utilize the newly introduced concepts in

the deferrable views, the newly built-in control flows which includes the @for

blocks would also make use of standalone components as well as lazy loaded

By the end of this course, we would have put together all these concepts to

cart application moreover, you would also have gotten enough knowledge and

upgrade your Angular application to the latest version and integrate signals

I guess you might have been wondering what are the needed prerequisites for

For you to take this course, you need to have a prior understanding of

You'd also need to be familiar with RxJS and Observables because at some point in

course, we are going to try to convert Observables to signals and also you need

If you are able to meet this prerequisites, then you should not have any

And with that, let's get started with this course.