Virtual DOM vs Signals — Modern Reactivity Patterns

In this tutorial, you will learn about Virtual Dom vs Signals. We cover key concepts, practical examples, and best practices to help you master this topic.

Signals have emerged as an alternative to Virtual DOM for reactive UI. Libraries like SolidJS skip the VDOM entirely.

Key Differences

• Virtual DOM: re-render entire tree, diff, patch
• Signals: granular updates, no diffing needed

// SolidJS (signals-based, no VDOM)
const [count, setCount] = createSignal(0);
<button onClick={() => setCount(c => c + 1)}>
  {count()}
</button>;

Signals update only the parts of the DOM that depend on changed values, with no VDOM overhead.