JavaScript Comments

Subject: JavaScript

JavaScript comments are used to write notes, explanations, or temporarily disable code without affecting the program’s execution. Comments improve code readability, help with debugging, and assist teams in understanding code logic.

Types of Comments in JavaScript

JavaScript supports two types of comments:

  • Single-line Comments
  • Multi-line Comments

1. Single-line Comments

Start with //. Everything after // on that line is ignored by JavaScript.

Syntax

Example

2. Multi-line Comments

Wrap your comment with /* */. This type of comment can span across multiple lines.

Syntax

Example

When to Use Comments

  • To explain complex logic
  • To label sections of code
  • To debug code by disabling certain lines
  • To leave reminders or TODO notes for developers

Best Practices for Commenting

  • Keep comments short, relevant, and updated
  • Don’t state the obvious (avoid redundant comments)
  • Use comments to explain “why”, not just “what”
  • Use consistent formatting (indentation, spacing)
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