Chapter 3

Building a Feature Across All Three

Pick a real feature — implement it everywhere.

~32 min total4 lessonsAssignment

By the end of this chapter you'll be able to

Build a feature in web
Implement on mobile
Add to desktop

Lessons

Module: Cross-surface

Picking the feature

What ships well across surfaces.

5measy

Web implementation

Next.js page + admin.

9mmedium

Mobile implementation

Expo screens.

9mmedium

Desktop implementation

Wails screens.

9mmedium

Chapter assignment

Ship Bookmarks on three surfaces

Add a Bookmarks feature: pick from your API's catalog, save to a personal list, view + delete from any surface. Implement on web, mobile, and desktop. Each surface should share the same Bookmark type + Zod schema from shared/.

See success criteria

Lesson 1 takes ~5 min.

Start chapter

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ch.2: Shared Types Everywhere ch.4: Sync + Offline