Pure-D framework

Pure-D tutorial

What is Pure-D?

Pure-D is a lightweight design and development approach focused on minimal, maintainable interfaces and code. It emphasizes clarity, small surface area, and composability so components are easy to understand, test, and reuse.

Core principles

• Simplicity: keep APIs and UI minimal.
• Separation of concerns: isolate presentation, behavior, and data.
• Composability: build complex UIs from small, focused components.
• Performance: favor small bundle sizes and fast rendering.
• Predictability: use explicit state flows and pure functions where possible.

When to use Pure-D

Use Pure-D for projects that need fast load times, long-term maintainability, or teams that value readable code and predictable behavior—single-page apps, design systems, dashboards, and mobile web UIs.

Project setup (example)

1. Initialize project:
   mkdir pure-d-appcd pure-d-appnpm init -y

2. Install minimal tooling (example with Vite + React):
   npm install react react-domnpm install -D vite

3. Create simple file structure:
   • src/
     • index.jsx
     • App.jsx
     • components/
       • Button.jsx
       • Card.jsx
     • styles/
       • vars.css
       • reset.css

Component guidance

• Make components small and focused: one responsibility per component.
• Prefer props for configuration; avoid implicit global state.
• Keep styling local and predictable (CSS modules, utility classes, or scoped CSS).
• Use pure functions for rendering when possible (no side effects in render).
• Example Button.jsx (conceptual):
  export default function Button({ label, onClick, variant = ‘primary’ }) { return {label};}

State management

• Start with local component state (useState or equivalent).
• Lift state only when multiple components need the same data.
• For global state, prefer minimal, explicit stores (context with reducer, or tiny state libraries).
• Keep side effects outside pure reducers; use effects/hooks for async work.

Styling approach

• Define design tokens in vars.css (colors, spacing, type scale).
• Use a small set of utility classes and component-scoped styles.
• Avoid heavy CSS frameworks that add unused rules; prefer handcrafted, purposeful styles.

Accessibility (a11y)

• Always include semantic HTML (buttons, forms, headings).
• Ensure keyboard navigation and focus states.
• Provide ARIA attributes when necessary, but prefer native semantics.
• Test with screen readers and Lighthouse.

Performance tips

• Code-split by route or heavy components.
• Compress assets and serve modern image formats.
• Use memoization for expensive renders.
• Minimize reflows; avoid deep DOM trees for simple UIs.

Testing

• Unit-test pure functions and component output.
• Use integration tests for state flows.
• Add end-to-end tests for critical user journeys.

Example: Build a small card list

• Create Card component (title, body, actions).
• Compose a CardList that maps data to Card components.
• Load data via a simple fetch hook; keep fetch logic separate from rendering.
• Paginate or virtualize lists when large.

Migration checklist (from heavy frameworks)

• Audit bundle for unused dependencies.
• Replace large UI libraries with focused components.
• Extract shared UI patterns into a small design-token-based system.
• Introduce incremental refactors rather than rewrites.

Conclusion

Pure-D is about making choices that favor clarity, tiny surface area, and predictable behavior. Apply its principles progressively: start with tokens and tiny components, keep state explicit, and prioritize accessibility and performance.

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