Simple to start, deep to master
Each challenge is scoped so you can get something working in under a weekend, with clear opportunities to extend and refactor.
A curated set of hands-on challenges that help you grow from “tutorial-watcher” to engineer who ships. Each challenge is built to be Substack-ready so you can follow along or share with your own audience.
Perfect for frontend devs and educators who want to turn challenges into content across LinkedIn, Substack, YouTube, and more.
“Build your own real-time search filter”
Use these challenges to sharpen your frontend skills and as a foundation for LinkedIn posts, newsletters, and video content.
Each challenge is scoped so you can get something working in under a weekend, with clear opportunities to extend and refactor.
Focus on building features you’d actually ship — routing, search, state management, PWA behavior — not just toy widgets.
Solve challenges with React, Vue, Svelte, vanilla JS, or your stack of choice. Revisit the same problem as your skills grow.
A comprehensive technical resource designed for developers preparing for JavaScript interviews at modern tech companies. Master core concepts, advanced patterns, and practical problems with working code examples.
From closures to design patterns
Run and modify real code
Polyfills, patterns, and strategies
This handbook is an excellent resource for frontend developers. It covers all essential JavaScript concepts — from basics to advanced — that are frequently asked in interviews.
— Akshay Kolhe, Nov 2025