Add comments in javascript

The Ultimate Guide to Adding Comments to Methods in JavaScript: Best Practices and Examples

Learn how to add comments to methods in JavaScript with this comprehensive guide. Discover best practices, advantages, and disadvantages of commenting code, and get examples of single-line, multiline, and JSDoc comments. Improve your code’s understandability today!

• Types of Comments in JavaScript
• JSDoc for Commenting Methods
• 4 JavaScript Syntax and Comments (JSDoc)
• Advantages and Disadvantages of Commenting Code
• Best Practices for Commenting Code in JavaScript
• Examples of Commenting Methods in JavaScript
• Additional JavaScript code samples for adding comments to methods can be found on our website
• Conclusion
• How do you write a comment in a method?
• What two ways can you make a comment in JavaScript?
• How to write method description in JavaScript?
• How to insert a comment that has more than one line in JavaScript?

If you’re a JavaScript developer, you know how important it is to write code that is easy to read, understand, and maintain. One of the best ways to achieve this is by adding comments to your code. Comments are annotations in the source code that are ignored by the interpreter. They are used to explain what the code does, why it does it, and how it does it. Commenting every method is recommended, and there are three types of comments in javascript : single-line, multiline, and JSDoc. In this blog post, we will provide you with a comprehensive guide on how to add comments to methods in JavaScript.

Types of Comments in JavaScript

JavaScript comments are annotations in the source code that are ignored by the interpreter. There are two types of JavaScript comments: single-line and multiline comments. Single-line comments start with // and multiline comments start with /* and end with */. Multi-line comments can be used to comment multiple lines of code. Inline comments are used to comment at the end of a line of code.

Here’s an example of a single-line comment:

// This is a single-line comment. 

And here’s an example of a multiline comment:

/* This is a multiline comment. It can span multiple lines. */ 

Inline comments can be used to explain what a line of code does:

var x = 5; // Declare a variable and assign it a value of 5. 

JSDoc for Commenting Methods

JSDoc is a preferred method of commenting for objects and functions in JavaScript. JSDoc is an abstract base class used for geometric subclasses. VSCode and most IDEs automatically process JSDoc comments. Commenting every single method is recommended, even if they seem simple. JSDoc comments should include a description of what the method does, its parameters, and its return value.

Here’s an example of a JSDoc comment for a method:

/** * This method calculates the sum of two numbers. * @param a - The first number to be added. * @param b - The second number to be added. * @return - The sum of a and b. */ function addNumbers(a, b)  return a + b; > 

In this example, the JSDoc comment explains what the method does, what parameters it takes, and what it returns.

4 JavaScript Syntax and Comments (JSDoc)

SUBSCRIBE — hit the bell 🔔and choose all: https://goo.gl/nYLZvzIn this lesson we’re going to learn Duration: 11:22

Advantages and Disadvantages of Commenting Code

Advantages of commenting include making code more understandable and clarifying code. Disadvantages of commenting include potentially cluttering code and writing comments that are redundant or unnecessary. Best practices for commenting include using clear and concise language, commenting code as soon as possible, and avoiding unnecessary comments. Tips for commenting include writing comments that explain why code is written a certain way and using comments to mark sections of code for future reference.

Best Practices for Commenting Code in JavaScript

Commenting every method is recommended, and the comment should describe what the method does. Best practices for commenting include using consistent formatting and avoiding comments that are too long or too short. Comments can be used to clarify code and make it more understandable. Comments can also be used to prevent execution when testing alternative code .

Examples of Commenting Methods in JavaScript

Let’s take a look at some examples of how to add comments to methods in JavaScript.

Here’s an example of a single-line comment:

// This is a single-line comment. 

Here’s an example of a multiline comment:

/* This is a multiline comment. It can span multiple lines. */ 

And here’s an example of a JSDoc comment for a method:

/** * This method calculates the sum of two numbers. * @param a - The first number to be added. * @param b - The second number to be added. * @return - The sum of a and b. */ function addNumbers(a, b)  return a + b; > 

Additional JavaScript code samples for adding comments to methods can be found on our website

In Javascript as proof, javascript comments code example

In Javascript as proof, Javscript function comments @ code sample

//Single line comments with 2 forward slashes /* Multi-line comments with start and closing comment symbol *///You can also use comments for Functions,Classes and Class Methods. /* Function/Class methods comments will display the comment to developers. Displays comment when hovering over the function/method name. Might also display comment with intellisense feature. Should work in most IDE with intellisense for language in use. May need to install and set correct intellisense for language in use. To be placed at top of functions, classes or class methods. *///EXPLANATION /** * Function/Class/Class-method Description ** Double asterisk adds list items ** You can add url for online resources just type url ** there as several @ options see https://jsdoc.app/ for list and description ** data-type is best typed in caps ** intellisense may color code data-type typed in caps ** Format of @options below * @option | | parameter-name | description * @return-option | | description *///IMPLEMENTATION EXAMPLE (Use example then call the function to see how it works) /** * Alerts a message to user ** Note: doesn't display title ** https://jsdoc.app * @param message Message to user * @param username This is username * @param age Age of User * @returns Boolean */ function AlertSomething(message,username,age)< alert(message + username + " . You are " + age + " years old"); return true; >AlertSomething("Hello ", "Alice", 25);

In Javascript , for instance, comments in js code sample

In Javascript case in point, how to add comment in javascript

/*It is easy and important so keep going and enjoy the way to coding still notr getting it then try follow me*/ // Single line comment is only for one line and multiline for two // It is a good way to keep notice of your codes /*Code*/

In Javascript as proof, commenting in javascript code sample

//import Navbar from "./components/Navbar"

In Javascript as proof, how to comment in javascript

Conclusion

Commenting is an essential part of writing understandable and maintainable code in JavaScript. JavaScript comments come in three types: single-line, inline, and multi-line/block level comments. JSDoc is a preferred method of commenting for objects and functions in JavaScript. Commenting every method is recommended, and best practices include using clear and concise language, commenting code as soon as possible, and avoiding unnecessary comments. By following these best practices and using the examples provided in this blog post, you’ll be able to write code that is easy to read, understand, and maintain.

Frequently Asked Questions — FAQs

What are JavaScript comments, and why are they important for method commenting?

JavaScript comments are annotations in source code that are ignored by the interpreter and help developers write notes in code to make it more understandable. Commenting every method is recommended to improve code’s readability and maintainability.

What are the types of comments in JavaScript?

There are three types of comments in JavaScript: single-line, multiline/block level, and inline comments. Single-line comments start with //, multiline comments start with /* and end with */, and inline comments are used to comment at the end of a line of code.

What is JSDoc, and why is it a preferred method of commenting for objects and functions in JavaScript?

JSDoc is an abstract base class used for geometric subclasses in JavaScript, and it is a preferred method of commenting for objects and functions. VSCode and most IDEs automatically process JSDoc comments, which include a description of the method’s parameters, return value, and what the method does.

What are the advantages and disadvantages of commenting code in JavaScript?

Advantages of commenting include making code more understandable, clarifying code, and marking sections of code for future reference. Disadvantages of commenting include potentially cluttering code and writing comments that are redundant or unnecessary.

What are the best practices for commenting code in JavaScript?

Best practices for commenting code in JavaScript include commenting every method, using consistent formatting, avoiding comments that are too long or too short, using clear and concise language, commenting code as soon as possible, and avoiding unnecessary comments.

What are some tips for commenting code in JavaScript?

Tips for commenting code in JavaScript include writing comments that explain why code is written a certain way, using comments to prevent execution when testing alternative code, and avoiding comments that state the obvious or duplicate what the code already expresses.

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JavaScript Comments

JavaScript comments can be used to explain JavaScript code, and to make it more readable.

JavaScript comments can also be used to prevent execution, when testing alternative code.

Single Line Comments

Single line comments start with // .

Any text between // and the end of the line will be ignored by JavaScript (will not be executed).

This example uses a single-line comment before each code line:

Example

// Change heading:
document.getElementById(«myH»).innerHTML = «My First Page»;

// Change paragraph:
document.getElementById(«myP»).innerHTML = «My first paragraph.»;

This example uses a single line comment at the end of each line to explain the code:

Example

let x = 5; // Declare x, give it the value of 5
let y = x + 2; // Declare y, give it the value of x + 2

Multi-line Comments

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

Any text between /* and */ will be ignored by JavaScript.

This example uses a multi-line comment (a comment block) to explain the code:

Example

/*
The code below will change
the heading with > and the paragraph with > in my web page:
*/
document.getElementById(«myH»).innerHTML = «My First Page»;
document.getElementById(«myP»).innerHTML = «My first paragraph.»;

It is most common to use single line comments.
Block comments are often used for formal documentation.

Using Comments to Prevent Execution

Using comments to prevent execution of code is suitable for code testing.

Adding // in front of a code line changes the code lines from an executable line to a comment.

This example uses // to prevent execution of one of the code lines:

Example

//document.getElementById(«myH»).innerHTML = «My First Page»;
document.getElementById(«myP»).innerHTML = «My first paragraph.»;

This example uses a comment block to prevent execution of multiple lines:

Example

/*
document.getElementById(«myH»).innerHTML = «My First Page»;
document.getElementById(«myP»).innerHTML = «My first paragraph.»;
*/

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