Data Exchange Between Components Using Angular Signals

Previously, Angular developers relied on @Input, @Output, or shared services to exchange data between parent and child components. While effective, these methods often introduced tighter coupling and complexity when managing global or shared states.

With the release of signals in Angular 16, and further enhancements in Angular 19, a new approach has emerged that simplifies data sharing. Signals provide a reactive, declarative, and performance-optimized way to transfer data, even between unrelated components.If you are new to signal please go through Angular Signals and It's benifits

In this guide, we’ll explore how to use signals step by step to share data between unrelated components in Angular efficiently.

Step-by-Step Guide

1. Create a Shared Signal Service

2.Parent Component

3.Child Component

1. Run application and check data will be updated once update button is clicked. In image each line details added in commented line.

Why Use Signals?

• Decoupled Architecture: Signals allow components to share state without direct dependencies, leading to more modular and maintainable code.
• Automatic Reactivity: Components automatically update when the signal value changes, reducing the need for manual subscriptions.
• Optimized Performance: Signals minimize unnecessary DOM updates, ensuring efficient change detection.

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