JavaScript Comments

In JavaScript, comments are used to add explanatory notes or annotations within the code. Comments are ignored by the JavaScript interpreter and do not affect the execution of the program. They are purely for human readability and documentation purposes.

There are two types of comments in JavaScript:

1. Single-line comments: Single-line comments start with two forward slashes (//). Anything after the // on the same line is considered a comment and is not executed. Here's an example:

// This is a single-line comment

var name = "John"; // Variable assignment

In the example above, the first line is a single-line comment, and the second line assigns the value "John" to the variable name.

2. Multi-line comments: Multi-line comments, also known as block comments, are used for longer comments or for commenting out multiple lines of code. They start with a forward slash followed by an asterisk (/*) and end with an asterisk followed by a forward slash (*/). Here's an example:

/* This is a multi-line comment

   It can span across multiple lines

   and can be used to provide detailed explanations or disable sections of code */

var age = 25; /* Variable assignment

                This comment spans multiple lines */

In the example above, the multi-line comment provides a more detailed explanation, and the variable assignment line is followed by a multi-line comment.

Comments are essential for code documentation, making the code more understandable and maintainable. They can help other developers (including yourself) understand the purpose, functionality, or limitations of certain code sections.