Comments in Javascript

In JavaScript, comments are used to add information to the code that is not executed or interpreted by the browser or the JavaScript engine.

There are two types of comments in JavaScript:

1. Single-line comments: Single-line comments start with // and continue until the end of the line. These comments are used to add a short description of what a particular line or block of code does.

For example:

// This is a single-line comment
var x = 5; // This assigns the value 5 to variable x

2. Multi-line comments: Multi-line comments start with /* and end with */. These comments are used to add a longer description or explanation of a block of code.

For example:

/*
This is a multi-line comment
It can span multiple lines of code
This block of code calculates the sum of two numbers
*/
var a = 2;
var b = 3;
var sum = a + b;

It's important to note that comments are ignored by the JavaScript engine when executing the code. Therefore, they don't affect the performance or behavior of the program. However, they are useful for developers to understand the code and for documentation purposes.