- To make code easy to understand It can be used to elaborate the code so that end user can easily understand the code.
- To avoid the unnecessary code It can also be used to avoid the code being executed. Sometimes, we add the code to perform some action. But after sometime, there may be need to disable the code. In such case, it is better to use comments.
- Single-line Comment
- Multi-line Comment
It is represented by double forward slashes (//). It can be used before and after the statement.
Let’s see the example of single-line comment i.e. added before the statement.
- // It is single line comment
Test it Now
Let’s see the example of single-line comment i.e. added after the statement.
- var a=10;
- var b=20;
- var c=a+b;//It adds values of a and b variable
- document.write(c);//prints sum of 10 and 20
Test it Now
It can be used to add single as well as multi line comments. So, it is more convenient.
It is represented by forward slash with asterisk then asterisk with forward slash. For example:
- /* your code here */
It can be used before, after and middle of the statement.
- /* It is multi line comment.
- It will not be displayed */