Do comments affect the speed of my website?

No. During the parsing step, the JavaScript engine completely ignores comments. Additionally, production build tools (minifiers) automatically strip all comments out before the code is sent to the user's browser.

Should I comment every single line of code?

Absolutely not. Over-commenting creates visual noise. Code should ideally be written clearly enough to be self-explanatory. Use comments only to explain complex logic or the 'intent' (why you did something, not what you did).

What is the difference between a normal comment and JSDoc?

JSDoc uses a specific format (`/** ... */`) that allows external tools and IDEs to parse it, providing intelligent autocompletion and type-checking, whereas standard comments are just raw text notes.

Do comments affect the speed of my website?

No. During the parsing step, the JavaScript engine completely ignores comments. Additionally, production build tools (minifiers) automatically strip all comments out before the code is sent to the user's browser.

Should I comment every single line of code?

Absolutely not. Over-commenting creates visual noise. Code should ideally be written clearly enough to be self-explanatory. Use comments only to explain complex logic or the 'intent' (why you did something, not what you did).

What is the difference between a normal comment and JSDoc?

JSDoc uses a specific format (`/** ... */`) that allows external tools and IDEs to parse it, providing intelligent autocompletion and type-checking, whereas standard comments are just raw text notes.

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JS Comments | JavaScript Tutorial

Master the different types of JavaScript comments. Learn to use single-line and multi-line annotations, implement JSDoc for professional documentation, and leverage 'commenting out' for efficient debugging.

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Documentation Notes

The systems used to document, organize, and disable code effectively.

Programming is a team sport. Comments are the notes you leave for yourself and your future teammates, ensuring the 'intent' behind your logic is never lost.

1The Annotation Protocol

JavaScript provides two primary ways to mark text as non-executable. Single-Line (//) is perfect for brief context or marking a line for deletion. **Multi-Line (/* ... */)** allows for structural explanations or temporarily disabling entire blocks of logic. Using these correctly keeps your codebase organized and understandable without affecting performance, as they are completely stripped away by the engine before execution.

2Documentation Hygiene

Professional JavaScript often uses JSDoc (comments starting with /**). These are special blocks that automated tools can parse to generate documentation websites. They also provide 'IntelliSense' in modern editors like VS Code, showing you exactly what type of data a function expects when you hover over it. Mastering these comments is a key step from 'coder' to 'engineer'.