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Lesson Notes

JavaScript Comments Explained (Simple)

Comments let you leave notes or disable code without affecting execution.

Single-Line Comments

Use // to comment out a single line:

// This is a single-line comment
console.log("This will run");
// console.log("This will NOT run");

Multi-Line Comments

Use /* ... */ to comment out multiple lines:

/*
  This is a multi-line comment.
  You can write as many lines as you need
  without adding // to each line.
*/
console.log("Code after a multi-line comment");

When to Use Comments

Explain complex logic
Leave TODOs or reminders for yourself
Disable code temporarily for testing
Provide references (links, docs, examples)

// TODO: Refactor this function for performance

/*
  Example usage:
  fetchData().then(data => {
    console.log(data);
  });
*/

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Variables with "const" and "let" keywords

String Interpolation (Template Literals)

Code comments

In this lesson, students will discover the essential role of comments in JavaScript, learning how to effectively use single-line and multi-line comments to enhance code readability, document logic, and streamline debugging. Elevate your coding skills by mastering the art of commenting to clarify your thought process and improve collaboration!

3m 2s