Signals

ELI5 — The Vibe Check

Signals are like tiny radio transmitters for your data. When a value changes, only the exact things listening to that signal update. No re-rendering the whole component tree, no diffing, just surgical precision updates. Every framework is adding them now.

Real Talk

Signals are a reactive primitive that provide fine-grained reactivity by tracking dependencies automatically. When a signal's value changes, only the specific computations and DOM nodes that depend on it update, bypassing component-level re-renders entirely.

Show Me The Code

const count = signal(0);
const doubled = computed(() => count.value * 2);
count.value++; // only 'doubled' and its consumers update

When You'll Hear This

"Signals make React's useState look like a sledgehammer" / "Every framework is shipping signals now, it's the new hotness"