GSD Practical Tutorial: Building a Calculator from Scratch
No pure theory—just follow along and build it. 14 practical episodes + 20 Q&A to master the GSD framework.
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Curriculum
Lesson 01 | Overall Idea & Act 1: Getting Started
Start with an idea, use GSD to create a project, conduct research, and lock down design decisions.
Lesson 02 | Act 2: Calculation Engine
Starting with the first test, completing tokenization and the Shunting-yard algorithm, and handling edge cases like floating-point precision.
Lesson 03 | Act 3: Let Users Press It
Draw the calculator UI using CSS Grid and event delegation; then use a state machine for keyboard handling and mode switching.
Lesson 04 | Act 4: Elderly Mode
Implement the most challenging elderly mode: dual-theme switching with CSS variables, WCAG ARIA standards, and flattening CSS layout overflow bugs.
Lesson 05 | Act 5: History and Responsiveness
Final feature polishing: implement a localStorage-backed history panel and a 3-breakpoint responsive layout.
Lesson 06 | Act 6: Wrap-up
Master GSD's verification methodology (goal backtracking and code review), and look back at the entire journey from a single sentence to 1529 lines of code.
Lesson 07 | GSD Q&A (Part 1): Basic Concepts
What is GSD? How is it different from just asking AI to write code? Answering 7 fundamental questions about GSD's core philosophy.
Lesson 08 | GSD Q&A (Part 2): Workflow Details
Detailed breakdown of what each command does, parameter controls, and the execution flow. Learn how to master the rhythm of /gsd-plan-phase and /gsd-execute-phase.
Lesson 09 | GSD Q&A (Part 3): Practical Tips & Troubleshooting
How to salvage things when issues arise: rolling back code, improving AI code quality, handling failed research steps, and introducing GSD to existing projects.