JavaScript Comments

Code often feels obvious when you first write it. A few weeks later, the same code can look confusing, especially in bigger files. Comments solve that problem by adding short explanations right where they are needed.

Comments are notes for humans that JavaScript ignores completely. They do not run and do not change output. Their job is to explain context, intent, and decisions. JavaScript supports two main types:

• Single-line comments
• Multi-line comments

Good comments make code easier to read and maintain, especially in team projects. They help you explain what the code is doing and why a specific approach was chosen.

Read about Comment Coding Guidelines

A single-line comment starts with //. Everything after those two slashes on that line is ignored by JavaScript. Use these for quick notes next to your code.

// This is a single-line comment

Multi-line comments let you write notes that span several lines. Start with /* and end with */. Everything in between is ignored.

/*
This is a multiline comment.
It's super useful for longer explanations
or temporarily "turning off" chunks of code.
*/ 

Use multi-line comments when one line is not enough, such as explaining logic flow, assumptions, or temporarily disabling a section during testing.

• Comments are notes in your code that JavaScript ignores. They help explain what your code does.
• Single-line: Start with //. Good for short notes.
• Multi-line: Wrap with /* */. Good for longer explanations or disabling code blocks.
• Comments make your code easier to read, maintain, and collaborate on.

What's next? Now that you know how to document your code clearly, let's look at statements in the next tutorial.

• What purpose do comments serve in JavaScript? Explain their significance in code readability and maintenance.
• How do you create a single-line comment in JavaScript? Can you provide an example of when you might use a single-line comment?
• Describe how to create a multi-line comment in JavaScript. When might you prefer using a multi-line comment over multiple single-line comments?
• Explain best practices for utilizing comments in code. How do you ensure that comments are useful and informative without cluttering the codebase?
• Are there any commonly accepted conventions or guidelines for writing comments in JavaScript? How do these conventions contribute to code collaboration and maintainability?