Description:
Angular v20 introduces a powerful new reactivity model called Signals, revolutionizing how developers handle state and reactivity in Angular applications. With traditional Angular using observables and @Input/@Output patterns, managing complex state or UI reactions often became cumbersome. Signals simplify this by offering a fine-grained reactive primitive—inspired by frameworks like SolidJS and Reactivity systems in Vue.
Signals in Angular v20 let you declare reactive state variables that automatically update the UI when their values change. Unlike observables, they are synchronous and don’t require subscriptions, making them simpler to use and reason about. You can use signals within components, services, and even templates using Angular's new APIs.
This reactivity model leads to:
- Cleaner, more maintainable code
- Reduced boilerplate
- Better performance with fewer change detection cycles
In this article, you’ll explore how to create, read, and update signals, how they interact with computed values and effects, and how they can be used to replace traditional BehaviorSubject or @Input-based workflows.
Advantages of Angular Signals
- Synchronous and predictable state changes
- Template-friendly reactive syntax
- Reduced boilerplate (no
.subscribe()orasyncpipe)
- Better performance due to granular change detection
- Great developer experience and debugging
Sample Code – Basic Signal Usage
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