Angular Signals Has a Free API — Here's How Reactive State Just Changed

TL;DR Angular Signals is the new reactive primitive in Angular 16+. It replaces complex RxJS patterns for state management with a simpler, fine-grained reactivity system — and it's built right into Angular core. What Are Angular Signals? Angular Signals are a new reactive primitive that track values and automatically notify consumers when those values change: Fine-grained reactivity — only re-render what actually changed No Zone.js needed — opt-in zoneless change detection Simpler than RxJS — for most state management use cases Built-in — no additional packages required TypeScript-first — full type inference Basic Signals import { signal , computed , effect } from " @angular/core " ; // Writable signal const count = signal ( 0 ); // Read the value console . log ( count ()); // 0 // Update the value count . set ( 5 ); count . update (( val ) => val + 1 ); // 6 // Computed signal (derived state) const doubled = computed (() => count () * 2 ); // 12 // Effect (side effects on change) effe