Comments

Comments let you leave notes in your code. They are ignored by JavaScript and exist only for humans reading the code.

Single-line Comments

Use // to comment out a single line:

// This is a comment
console.log('Hello') // This prints Hello

Multi-line Comments

Use /* */ to comment out multiple lines:

/*
  This is a multi-line comment.
  JavaScript ignores all of this.
*/
console.log('World')

Why Comments Matter

Good code should be self-documenting — readable without needing many comments. But comments are useful for:

• Explaining why something is done (not just what)
• Temporarily disabling code while debugging
• Marking TODOs and FIXMEs