Comments in JavaScript

Comments are lines in your code that JavaScript ignores when running the program. They are used to explain what the code does, making it easier to understand later – for yourself or for others reading your code.

Good comments improve code readability and help with debugging and collaboration.

Single-Line Comments

Use // for comments on a single line. Everything after // on that line is ignored.

Multi-Line (Block) Comments

Use /* to start and */ to end a comment that can span multiple lines.

When to Use Comments

• Explain complex logic.
• Document functions or variables.
• Temporarily disable code during testing (comment out lines).
• Add notes for future improvements.

Avoid over-commenting obvious code – write clear code instead.

Practical Example

Quick Quiz