Praveen Kumar

~/learn — practice

$ learn --overview

Senior frontend labs

In-browser code labs with live preview and tests — build systems, debug production, ship platform work.

2 paths · 11 lessons · 10 live labs

platform6h · advanced

Frontend Platform Labs

Production-grade frontend platform work — component APIs, design tokens, codemods, prod triage, and migration strategy.

0/4 lessons · 3 labs

Open path →
reactplatformdesign-systemsobservability
internals8h · advanced

Build a Reactivity Engine

From signals to DOM updates — build a mini reactivity library from scratch in vanilla JavaScript.

0/7 lessons · 7 labs

Open path →
javascriptreactivityinternals

How labs work

  1. 1.Pick a path and open the first lesson.
  2. 2.Follow the brief — goal, steps, and hints live beside the editor.
  3. 3.Edit the highlighted file and watch the preview update.
  4. 4.Run tests when ready; progress saves in your browser.