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Practical Angular Signals : Levelling Up Your Web Development Skills with Signals, Patterns and Architectures

Name: Practical Angular Signals : Levelling Up Your Web Development Skills with Signals, Patterns and Architectures
Author: Sonu Kapoor
ISBN: 9798868820076

by Sonu Kapoor

October 2025

Intermediate to advanced

137 pages

1h 49m

English

Apress

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Apress Pocket Guides
Practical Angular Signals
Foreword
Introduction
Table of Contents
About the Author
About the Technical Reviewer
1. Setting Up the Signals-First Shopping Cart App
Project GoalsStarting a Standalone Angular AppProject StructureNew ExtensionsCreating the Product ModelModeling Product State with Signals in a ServiceDisplaying Product Count in the Home PageFine-Grained Change Detection in the TemplateRouting to the Home PageArchitectural NoteSummary
2. Modeling Product and Cart State with Signals
Folder Structure UpdateDefining the Cart Item ModelWhy Store Full Product Objects Instead of Just IDs?Creating the Cart ServiceSidebar: What About NgRx Selectors?Integrating the CartArchitectural NoteSummary
3. Effects, APIs, and Async Data with Signals
Folder Structure UpdateRefactoring ProductService with httpResource()What httpResource() Gives YouA Note on EagernessTriggering Fetches ReactivelyUnderstanding effect(): Reactive Side Effects Made SimpleImportant Note on effect() and Injection ContextSolution 1: Use the ConstructorSolution 2: Use runInInjectionContext()Displaying Data with httpResource()Connecting the HomeComponentWorking with External APIsNgRx Effects vs. Signal EffectsArchitectural NoteWhat You Should See in the BrowserSummary

4. Component Communication with Signals
Folder Structure UpdateCreating a Shared Cart Header ComponentRendering the Header in the ShellPassing Signals to Child ComponentsArchitectural NoteComparison Note: Without SignalsSummary
5. Routing, Guards, and Auth with Signals
Folder Structure UpdateCreating the Authentication ServiceCreating a Login PageCreating a Checkout Page and Route GuardCreate the GuardProtecting the RouteA Minimal Checkout ViewTry It YourselfControlling Access to Cart ActionsUpdating the Header to Show Auth StateArchitectural NoteWhy This Is Cleaner Than NgRxWhat About Signal Routers?Why This Matters in the Real WorldSummary
6. Testing, Debugging, and Performance Tuning
Why We Skipped Tests Until NowFolder Structure UpdateWriting Tests for Signal-Based ServicesComparing Signal-Based Tests to RxJS-Based TestsTesting Signal-Driven ComponentsTest SetupTest: Should Show a Login ButtonTest: Should Display Total Items from the Cart Service SignalDebugging Signals with Angular DevToolsDebugging with Inline EffectsSignal Hygiene: Patterns That ScaleSummary
7. From RxJS to Signals – Migration and Interoperability
Working Alongside RxJSIntroducing linkedSignal() – Controlled Bridging with External StateArchitectural Decision: Push vs. PullNgRx Store Migration – A Deep DiveReplacing Selectors with Computed SignalsReplacing Reducers with Signal StateReplacing Effects with effect() and Async Data with linkedSignal()Replacing Store Dispatches with Method CallsA Realistic Migration PathWhen NgRx Still Makes SenseSummary
8. Completing the Cart Experience with a Sidebar
Chapter GoalsFolder Structure UpdateUI ServiceBuilding the Cart ComponentSidebar StylingBuilding the Cart Sidebar ComponentSidebar TemplateSidebar StylingHeader EnhancementsCheckout PageUI Integration in App ComponentSummary
9. Final Words – Signals in Action
A Fully Reactive Shopping CartSimpler, Smaller, and StrongerWhat We Left OutWhere to Go from Here

Content preview from Practical Angular Signals : Levelling Up Your Web Development Skills with Signals, Patterns and Architectures

S. KapoorPractical Angular SignalsApress Pocket Guideshttps://doi.org/10.1007/979-8-8688-2007-6_4

4. Component Communication with Signals

Sonu Kapoor¹

As applications grow, state and logic often need to be shared between components: parents and children, siblings, or deeply nested views. In traditional Angular applications, this has typically involved @Input(), @Output(), shared services, or EventEmitter.

In a Signals-first architecture, we still use services to share state, but the mechanics of communication are far simpler. Signals give us an always-fresh, read-only view of the current state. Components can read from signals declaratively, ...

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Practical Angular Signals : Levelling Up Your Web Development Skills with Signals, Patterns and Architectures

by Sonu Kapoor

4. Component Communication with Signals

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.