Learn Solid-js - 10 Code Examples & CST Typing Practice Test
SolidJS is a fast, reactive JavaScript library for building user interfaces using fine-grained reactivity and a compile-time optimized rendering model. It emphasizes performance, predictable state updates, and minimal abstraction.
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Learn SOLID-JS with Real Code Examples
Updated Nov 22, 2025
Explain
SolidJS allows developers to build highly performant, reactive web applications using signals and fine-grained updates.
It uses JSX for declarative UI composition, similar to React.
Solid avoids a virtual DOM and instead compiles templates into optimized DOM instructions.
Core Features
Signals for state management
Effects and memos for reactive computations
JSX templating with compile-time compilation
Context API for dependency management
Solid Router for SPA navigation
Basic Concepts Overview
Signals (`createSignal`)
Effects (`createEffect`)
Memos (`createMemo`)
Components using JSX
Stores for structured state
Project Structure
src/ - main application code
src/components - reusable UI
src/routes - route-based files (if router used)
public/ - static assets
vite.config.js - build configuration
Building Workflow
Define components with functions returning JSX
Use signals for reactive state
Use effects for side effects
Use Solid Router for navigation
Build with Vite using `npm run build`
Difficulty Use Cases
Beginner: simple component-based apps
Intermediate: SPA with Solid Router
Advanced: streaming SSR and hydration
Expert: fine-grained reactive architecture
Community: building Solid libraries or primitives
Comparisons
Faster than React due to no VDOM
More predictable reactivity than Vue
More fine-grained than Svelte
Smaller runtime than Angular or React
Closer to Knockout or MobX in reactivity model
Versioning Timeline
2020 - SolidJS 1.0 early release
2021 - SolidJS 1.0 official release
2023 - Solid Start beta for SSR apps
2024 - Ecosystem libraries mature
2025 - SolidJS 2.0 direction begins
Glossary
Signal: a reactive value container
Effect: side-effect triggered on signal change
Memo: cached reactive computation
JSX: declarative UI syntax
Hydration: attaching events to SSR output
Frequently Asked Questions about Solid-js
What is Solid-js?
SolidJS is a fast, reactive JavaScript library for building user interfaces using fine-grained reactivity and a compile-time optimized rendering model. It emphasizes performance, predictable state updates, and minimal abstraction.
What are the primary use cases for Solid-js?
High-performance web apps. Highly interactive dashboards. Dynamic UI widgets and embedded components. Single-page applications (SPAs). Reactive data-driven interfaces
What are the strengths of Solid-js?
Extremely high performance (beats React, Svelte, Vue in many benchmarks). Predictable signal-based state updates. Simple mental model compared to frameworks with VDOM. Small bundle size and fast runtime. JSX familiarity for React developers
What are the limitations of Solid-js?
Smaller ecosystem compared to React or Vue. Not ideal for huge enterprise apps requiring standardized patterns. Requires understanding of reactive primitives. Less community-provided tooling. SSR requires some learning for streaming approach
How can I practice Solid-js typing speed?
CodeSpeedTest offers 10+ real Solid-js code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.