ReactForge•100 Machine Coding ChallengesLearn React by building, not by watching.
Sharpen your skills with hands-on practice. Solve 100 practical React coding tasks with interactive state, real evaluation criteria, and clean source code.
Interactive Senior Laboratories
Explore dedicated production-grade environments designed to simulate high-scale performance, real outage postmortems, and isolated code execution.
Performance & Profiler Lab
Benchmark 10,000 DOM rows in real-time (virtualized vs non-virtualized 60fps), inspect live Web Vitals (LCP/CLS/INP), and analyze React render trees.
Production Incident Simulator
Interactive side-by-side execution of real-world production outages: memory leaks, hydration mismatches, debounce race conditions, and infinite render loops.
Live React 19 Playground
Interactive browser sandbox with instant hot reload, real-time streamed console logging, and live accessibility (A11y) tree verification.
From JavaScript to Machine Coding Mastery
Follow this connected progression path: bring your JavaScript foundations and master the 3 in-lab stages across 100 tasks.
JS Foundations
Variables, Arrays, Functions & DOM
ES6+ Syntax
Arrow functions, .map(), Destructuring
Stage 1: State & UI
40 Tasks: Password Gen, Todo, OTP, Modal
Stage 2: APIs & Hooks
35 Tasks: Autocomplete, Infinite Scroll, Multi-Step
Stage 3: Architecture
25 Tasks: Undo/Redo, Virtual Table, Kanban
Everything You Need to Know
Transparent requirements and real skills you will build across the 100 tasks.
The Purpose
To complement concept learning with active coding practice. By solving tasks independently, you develop real muscle memory for handling state, props, and UI events.
Prerequisites
You only need basic JavaScript ES6 (arrow functions, .map(), destructuring) and basic HTML/CSS. You start immediately with Stage 1 tasks!
What You Master
Master immutable state updates, custom hooks (useDebounce), async REST calls, virtual lists, and production-ready component patterns.
AI Interview Coach & Live Advisor
Ask architectural questions, get customized study roadmaps, or practice answering frontend interview curveballs.
ReactForge AI Coach
Online
👋 Welcome to the ReactForge AI Interview Coach!
I can help you build a personalized study roadmap from our 100 tasks, review React 19 architectural patterns, explain time/space complexities, or simulate FAANG frontend system design interviews.
Try clicking any quick question below or type your own question!
Featured Machine Coding Tasks
A curated preview of essential interview benchmarks across all 3 tracks.