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 and Implementing Signals in Programming

This tutorial delves deeper into correctly establishing signals and the different data types that signals can accept. Various code snippets are used to illustrate these ideas, helping readers understand these concepts practically.

The initial step in creating a signal is declaring the signal variable within the component's code. For instance, if a signal named 'name' is declared, it will take in a string as a data type. Here's how this looks in code:

To access the 'name' variable, string interpolation can be used in templates, and then the signal can be invoked as a function:

After saving the work, the 'name' variable becomes visible in the browser's console.

Signals aren't limited to string data types. They can also accept numbers:

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# Understanding and Implementing Signals in Programming

## Introduction

This tutorial delves deeper into correctly establishing signals and the different data types that signals can accept. Various code snippets are used to illustrate these ideas, helping readers understand these concepts practically.

## Creating Signals

The initial step in creating a signal is declaring the signal variable within the component's code. For instance, if a signal named 'name' is declared, it will take in a string as a data type. Here's how this looks in code:

```javascript
let name = Signal('John');
```

To access the 'name' variable, string interpolation can be used in templates, and then the signal can be invoked as a function:

```javascript
`${name()}`
```

deji adesoga

In the first lesson of this module, while trying to exemplify the concept of

we're able to declare our first signal when we were trying to differentiate the

of signals in comparison to RxJS observables.

In this lesson, we'll be able to go in depth and to how to properly create

the different data types are acceptable by signals.

As you can see, within the components called, how-to-create-a-signal, I'm going

As you can see in our Visual Studio Code, the first signal is called name and

If we want to assess this name variable right here, all we need to do is to head

to templates, create a tag, and then create a string interpolation and then

calling the name variable and attaching a parenthesis to it because signals are

So if I save everything we've done so far, you can see the name Dave in the

We can also see the next variable we defined here, which is a number.

So the first variable we can see defined here is a string.

Signals can also access numbers and it's also accessible the same way we

The next variable we have here is a Boolean, which is set to true.

The second variable is also a Boolean, which is set to false, which are all

Next up, we pass in null as a data type, as well as undefined, as we can see

Another set of data type, acceptable by signals are arrays.

As can see, we're able to define an array with the string a, b, and c.

Right below that, we have signals accepting objects as initial values, which is

Moving on, we can see we can also pass in nested arrays into a signals.

As we can see how deeply nested this array is.

Yet, we don't get any error from signals because it's totally acceptable, just

Nested objects are also acceptable with signals.

As you can see, we have a deeply nested object, perfectly acceptable by

If I scroll to the last variable, which is called profile, you can see that

This generic type called person, is defined above, as you can see, and it accepts

If I scroll back to the bottom of the page, you can see we're able to define

called name, accepts the string code Johns.

To display this signal in our templates, all you need to do is just to call the

But this time around, we need to pass in the name, which is within the object.

And when I save, and once the browser refreshes, we're able to assess the value

So in this lesson, we've been able to see that we can define signals using

data types ranging from strings to numbers to arrays, objects, and much more.