Clean Coding: Techniques for Writing Good Code Made Easy with Cooking Analogies

# Lecture 09. Clean Coding

## New Lesson Posting Announcement

Hello, students! For this course, **175** new lessons (totaling 22 sections) are scheduled to be posted sequentially. Since I am producing multiple courses simultaneously, I am proceeding by posting **a little bit of each course alternately**, rather than uploading one entire course at once. Below are the posting principles and the posting schedule for each section of this course.

> For your reference, the lessons being posted now are not entirely new content, but are part of the process of creating **revised editions (2nd or 3rd editions)** that reinforce existing lectures.

## Posting Principles

- Currently, I am rotating through a total of 19 courses in order (circular method), posting one lesson per course alternately.
- Postings take place on weekdays (Mon-Fri), with 5 new lessons uploaded daily across all courses.
- For this course, the next lesson will be posted each time its turn in the rotation comes around.
- While the posting speed may feel slow compared to other courses, all courses are progressing together in the same manner.

## Posting Schedule by Section (Total 22 Sections)

| Section | Number of Lessons | Start Date | End Date |
|---|---|---|---|
| Section 1. The Beginning of Good Variables | 8 | 2026-07-02 | 2026-08-10 |
| Section 2. Function Design | 8 | 2026-08-14 | 2026-09-21 |
| Section 3. Modularization and Structure | 7 | 2026-09-25 | 2026-10-28 |
| Section 4. Deduplication & Abstraction | 8 | 2026-11-03 | 2026-12-09 |
| Section 5. Testing and Quality | 8 | 2026-12-15 | 2027-01-19 |
| Section 6. Comments and Documentation | 8 | 2027-01-25 | 2027-02-24 |
| Section 7. Collaboration and Code Review | 8 | 2027-03-01 | 2027-03-29 |
| Section 8. Exception Handling and Error Response | 8 | 2027-03-31 | 2027-04-28 |
| Section 9. Tool Utilization and Automation | 8 | 2027-05-03 | 2027-05-28 |
| Section 10. Naming Conventions and Domain Language | 8 | 2027-06-02 | 2027-06-28 |
| Section 12. Refactoring in Practice | 8 | 2027-07-01 | 2027-07-26 |
| Section 13. Code Smell Detection | 8 | 2027-07-29 | 2027-08-19 |
| Section 14. Security and User Considerations | 8 | 2027-08-23 | 2027-09-10 |
| Section 15. Code Disclosure and Open Source Etiquette | 8 | 2027-09-14 | 2027-10-04 |
| Section 16. What is Good Code? | 8 | 2027-10-06 | 2027-10-26 |
| Section 17. [Advanced] Performance Improvement and Optimization | 8 | 2027-10-28 | 2027-11-17 |
| Section 18. [Advanced] Debugging and Problem Solving | 8 | 2027-11-19 | 2027-12-08 |
| Section 19. [Advanced] Design Patterns and Principles | 8 | 2027-12-10 | 2027-12-28 |
| Section 20. [Advanced] Latest Technologies and Tech Trends | 8 | 2027-12-30 | 2028-01-14 |
| Section 21. [Advanced] Improving Existing Code | 8 | 2028-01-18 | 2028-02-02 |
| Section 22. [Advanced] Maintenance-Friendly Code | 8 | 2028-02-03 | 2028-02-21 |
| Section 23. [Advanced] Integrating Various Languages and Technologies | 8 | 2028-02-22 | 2028-03-08 |

## Estimated Completion

Based on the current pace, the estimated completion time for all postings of this course is **around March 2028**. (The actual schedule may be moved forward or delayed depending on production progress.)

At the request of our readers, we are issuing a 66% discount coupon for "Cognitive Load Management Techniques to Break Through the Limits of RAG Performance" (the 990,000 KRW course can be purchased for 330,000 KRW).

For your information, this course is currently in the process of posting the 2nd edition, which is a revision of the 1st edition.

In the case of the 2nd edition, all class materials have been posted, but the videos are still in the process of being uploaded.

I post the 2nd edition videos frequently, but it will take a long time (at least several months) to post all of them.

Please keep this in mind and carefully decide whether to use the coupon.

The deadline is the 19th and there is a limited number of coupons available, so please hurry if you need one.

You can download the coupon by entering the address below into your browser's search bar.

https://inf.run/QowXG

Hello.

The era of AI writing code has arrived.

However, the task of verifying the code written by AI and directing the path for improvement remains the responsibility of humans.

Furthermore, it has become necessary to know how to utilize AI more extensively in both vertical and horizontal directions.

The horizontal direction refers to a direction that encompasses everything from planning to deployment, and

The vertical direction refers to a direction that can encompass various languages, various frameworks, and various methodologies.

Therefore, a developer with a broad spectrum (that is, a complete spectrum in both vertical and horizontal directions)

will be needed.

However, the education system has not yet been able to keep up with this.

That is why I have opened the "Structural Code Reading Bootcamp" using Claude Code.

At https://code-reading-bootcamp.vercel.app/, you can develop the ability to read code written by both AI and humans, and

You will be able to develop the ability to guide AI on how to improve code.

It includes gamification elements, so you can have fun while tracking your skill improvements.

It is free to use anytime without the need to log in.

Although there are some shortcomings and parts where the questions have not yet been filled in,

I introduce this with the hope that it will be helpful to you.

I would appreciate it if you could use it lightly.

February 10, 2026, Sincerely, Jinsu Park (Arigaram).

I have completed sections 1-16, which are the basic sections of "Clean Coding".

Thank you for waiting patiently without saying anything all this time.

I'll also work on completing the [Advanced] sections provided as bonuses,

The [Basic] sections alone are sufficient for learning clean coding techniques without any issues

For now, please consider this course as primarily complete and take it. I would appreciate it.

We have posted all the lecture videos for "Section 5. Passing the Sanitation Inspection - Testing and Quality".