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    JS Comments

    Editorial StaffBy Updated:No Comments2 Mins Read

    JavaScript comments

    Developers use JavaScript comments to explain their JavaScript code not only to themselves but also to other fellow developers. It is a good practice to write comments as you code.

    With the help of JavaScript comments, we can be preventing execution when testing alternative code.

    Example: Commenting all code

    
// The code below won't execute, as it is marked as a comment, preventing its execution

// var num3 = 5 + 6;

    Single line comments

    Single line comments start with //.

    Example

    
// This is a single line comment

var num1 = 1 + 2;

var num2 = 3 + 4; // This is an inline comment

    Multi-line comments

    Multi-line comments start with /* and end with */.

    Example: 1

    
/*

When you have a lot to explain,

use multi-line comments

like this

*/

var num4 = 7 + 8;

    Example: 2

    
<!DOCTYPE html>
<html>
<body>

<h2>JavaScript multi-line comments Example</h2>

<p> a, b, and c are variables.</p>

<p id="test"></p>

<script>
var a = 7;
var b = 10;
var c = a + b;

/* where a, b, and c, are three variables

and declared these variables with the var keyword.
*/

document.getElementById("test").innerHTML =
"The value of c is: " + c;
</script>

</body>
</html>
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