SolidJS Development

SolidJS is a declarative JavaScript library for building user interfaces with fine-grained reactivity. Unlike virtual DOM frameworks, Solid compiles templates to real DOM nodes and updates them with fine-grained reactions.

Core Principles

1. Components run once — Component functions execute only during initialization, not on every update
2. Fine-grained reactivity — Only the specific DOM nodes that depend on changed data update
3. No virtual DOM — Direct DOM manipulation via compiled templates
4. Signals are functions — Access values by calling: count() not count

Reactivity Primitives

Signals — Basic State

import { createSignal } from "solid-js";

const [count, setCount] = createSignal(0);