🍪 Bite Size #1: Comments in JavaScript

The two difference of comments in JavaScript code and their use cases

Photo by Luca Bravo

There are two types of comments in JavaScript:

1. Single-Line Comment - //
Single-line comments start with two slashes //. Anything after // on the same line will not be executed.
   
   Example:
   // My cup is empty.
let cup = 0;

// Fill it please!
let coffee = 5;
cup = coffee;

// Thanks!
console.log(`I have ${cup} cups of coffee now! ☕`)

2. Multi-line Comments - /* */
Multi-line comments start with /* and end with */. Everything between these symbols will not be executed.
   
   Example:
   /*
Did you know that whales cannot breathe underwater?
The average whale can hold its breath for about 60 minutes.
*/

   const whale = {

   type: mammal;
holdBreath: 60;
swim: true;
}

Use cases:

1. Explain code – Describe what specific blocks or lines do for clarity.

2. Leave reminders – Note tasks or improvements using TODOs or FIXMEs.

3. Debug code – Temporarily disable lines without deleting them.

4. Document functions – Describe parameters, return values, and behavior.

5. Improve collaboration – Help others (and future you) understand the logic.

This is Random Nice Stuff’s Nice Bits. Tiny, bite-sized, digestible bits of randomness I’ve found along the way. No rules. Just nice bits.