Why Comments Matter

In software development, comments serve as companions to code, helping us document thought processes, explain complex logic, and provide guidance for future maintainers. However, the art of commenting lies in finding the right balance—neither too verbose nor too sparse. This article explores how to write comments that are both elegant and effective.

The Purpose of Comments

First, let's understand the value of good comments:

• Enhanced Readability: Well-crafted comments enable other developers or your future self to quickly understand the functionality and purpose of code segments.
• Improved Team Collaboration: In team projects, clear comments reduce communication overhead and onboarding time for new members.
• Streamlined Debugging: When issues arise, comments can help pinpoint problem areas more efficiently.

Comments are essential. Reading source code without them increases cognitive load, similar to examining frameworks with minimal documentation. The lack of comments isn't necessarily because developers don't understand the code, but sometimes because it wasn't designed for easy comprehension.

Commenting Principles

To write effective comments, consider these principles:

• Relevance: Comment only on important logic and decisions, avoiding obvious code explanations.
• Conciseness: Keep comments brief and to the point, avoiding unnecessary verbosity.
• Clarity: Ensure comments clearly express their intent, avoiding ambiguous descriptions.
• Maintenance: Update comments as code changes to prevent misleading information.

Here are some examples of problematic comments worth reflecting on:

/*
* You might think you understand the code below,
* but you really don't. Trust me.
* Just move on, otherwise you'll spend sleepless nights,
* cursing this comment while thinking you're smart
* enough to "optimize" the code below.
* Just close this file and go do something else.
*/

// I'm not sure if we actually need this, but I'm too afraid to delete it.

// Made me add this. Not my idea.

Practical Techniques

In actual coding practice, these techniques can improve your commenting:

• Function and Method Documentation: Provide brief descriptions for each function, including parameters, return values, and potential exceptions.
• Complex Logic Explanations: For intricate algorithms or business logic, include concise explanations of purpose and implementation.
• TODO Annotations: Use TODO markers to identify areas requiring further work or improvement.
• Documenting Assumptions and Decisions: Comment on the reasoning behind specific implementation choices or architectural decisions.

Modern AI coding assistants can significantly reduce typing time during development. The time saved can be invested in refining comments. This not only improves personal understanding but also helps others more quickly grasp and maintain the codebase.