Comments are useful notes in React.js that improve:
- Readability
- Maintainability
- Collaboration
of your codebase. In this post article tutorial guide, we will cover the following:
- What comments are.
- Why they matter in React.js development.
- Different ways to add comments.
- Tips for writing good comments.
Comments act as brief explanations that you add to your program code to help it serve its intended purpose. They are commonly useful for deciphering your Programs code, debugging it, and assuring its maintenance plus functionality of your special or logical code.
Adding comments to your React.js code has the same effect as adding notes to a recipe in terms of making it easier to read. In this instructional article, we’re going to provide a clear and understandable explanation of how to add comments in React JS.
Comments simply mean non-executable lines of text within your code.
In React.js, comments are like helpful notes you put in your code. They are designed to help people (like developers or programmers) in understanding what is happening, not to actually do any actions when the computer executes and runs the code. This is what comments do:
- They explain things.
- They make code clearer.
- They give extra information.
So, comments in React.js are like little explanations or notes that only humans read, not the computer.
Why Should You Use Comments in React JS?
There are many reasons why you should use comments in React JS:
Easy Understanding
Comments are like notes that help you understand your code better, just like notes help you remember what you learn in school.
Fixing Problems (Debugging Assistance)
Comments are like hints that help you find and fix issues in your code, kind of like solving puzzles or finding hidden objects in a game.
Writing Things Down (Documentation)
Comments are like writing down what your code does, so you don’t forget, just like taking notes in class to remember what the teacher says.
Teamwork
Comments make it easy for you and your friends (other developers) to work together, just like playing on a team in sports or games.
Keeping Things Neat (Code Maintenance)
Comments help (assits) you keep your code clean and tidy (Simple) , similar to keeping your room clean and super organized.
Different Ways to Comment in React JS
In React JS, there are several ways to add comments, just like we have different tools for different tasks:
Single-line Comments – Quick Explanations
How to Write a Single-line Comment
Single-line comments: Use two forward slashes (//) to comment out a single line of code.
For example:
// This is a single-line comment
When to Use a Single-line Comment:
Use single-line comments when you need to provide brief context or explanations for specific lines or expressions.
For example:
const total = price + tax; // Calculate the total cost
Multi-line Comments – For Detailed Notes
How to Write a Multi-line Comment:
Multi-line comments in JavaScript are made using /* and */ symbols.
In JSX, you can still use /* and */ for multi-line comments.
For example:
/* This is a multi-line comment
that covers multiple lines. */
When to Use a Multi-line Comment:
Use multi-line comments when you want to:
- Describe complex logic.
- Provide context for entire components.
- Temporarily remove blocks of code.
For instance, you can use multi-line comments to explain a component’s purpose and dependencies, like this:
/*
This component renders a list of products.
It fetches data from an API and displays it in a responsive grid.
Please note that this component relies on ‘ProductCard’ components.
*/
JSX Comments – For Special JSX Code
How to Write a JSX Comment:
In JSX, you use curly braces ({/* */}) to comment out parts of your JSX elements or components. Here’s an example:
return (
<div>
<h1>Welcome to my website w3ipedia </h1>
{/* <p> Under construction </p> */}
</div>
);
When to Use a JSX Comment:
Use JSX comments when you need to:
- Explain JSX-specific code.
- Temporarily disable JSX elements, such as when you want to hide a component or element during development.
For example:
{/* <Debugging Component /> */}
So, just like you choose different tools for different jobs, you can use these comment methods to explain, organize, and clarify your code in React JS.
Guidelines for Writing Great Comments
Good comments can make your code better, just like following some rules can make your games more fun. To ensure your comments are valuable and maintainable, follow these best practices:
Be Clear and Short:
Make your comments short and easy to understand. Do not use too many words. Short comments are more likely to be read and make sense.
Not So Good Example:
// This function is responsible for fetching data from the API using an asynchronous HTTP request and then processing it to display it on the screen.
Better Example:
// Get data from the API and show it on the screen.
Explain What and Why
Don’t just restate the code’s instructions. Describe its purpose and why it exists. similar to explaining the history of your code.
Bad Example:
const x = 10; // Set x to 10
Improved Example:
const initialCounterValue = 10; // Start the counter at 10
Use Good Names
The names of objects (such variables and functions) matter; choose carefully. Others can comprehend your code without a lot of comments if it has a name that makes sense.
Bad Example:
const c = calculateTotal(a, b); // Calculate the total
Improved Example:
const totalPrice = calculateTotal(subtotal, tax); // Calculate the total price with tax
Don’t Use Comments to Fix Bad Code
Do not depend on comments to clean up an unprofessional or confusing piece of code. As an alternative, make the code simpler to read and understand.
Keep Comments Up to Date
Code changes over time, like how your story might change as you go along. When you make changes, remember to update your comments to match the new code.
How to Comment In React JS Shortcut
Open Your React.js Project:
Start by launching your React js project in the code editor of your choice or your Selections of Editor.
This shortcut functions in the majority of editors, whether it be Visual Studio Code, Sublime Text, or another one.
Select the Code to Comment:
Keep your attention on the particular code you want to comment on. To pick the code lines you want to remove the comments from, click and drag the mouse over them. It’s up to you whether it’s one line or several lines.
Use the Keyboard Shortcut:
The enchantment happens here! Use the following keyboard shortcut to comment out the selected code:
- For Windows/Linux: Press Ctrl + /
- For macOS: Press Cmd + /
Review and Edit:
The selected code will become a comment when you use the shortcut. Review it briefly to make sure it includes the relevant context. If further detail is required, you can always update the comment.
Save Your Changes:
Make sure to save your work to ensure its safety. You can be certain that your code and comments are stored properly in this way. To ensure that your notes are saved for later, saving is a crucial step.
Keyboard Shortcut keys commonly used in React.js:
For Windows/Linux:
- To comment code: Ctrl + /
- To uncomment code: Ctrl + /
- To save changes: Ctrl + S
For macOS:
- To comment code: Cmd + /
- To uncomment code: Cmd + /
- To save changes: Cmd + S
With the help of these shortcuts, you can code in React.js more quickly.
People Also Read
FAQs- About React JS Comment
How do you comment multiple lines in React JS?
In React.js, you can comment out multiple lines by enclosing the code block you want to comment in {/* … */}.
For example:
{/*
This is a multi-line comment in React JS
You can comment out several lines of code like this.
*/}
What is the shortcut to comment code in React JS?
The shortcut to comment code in React JS, as well as in most code editors, is Ctrl + / for Windows/Linux and Cmd + / for macOS. Select the code you want to comment and use this shortcut.
How do you comment in React TypeScript?
Commenting in React TypeScript is the same as commenting in regular React. You can use single-line comments with //, multi-line comments with /* */, or JSX comments with {/* */}.
How to add a comment to JavaScript?
- Use // to add a single-line comment in JavaScript.
- /* */ to add multiple lines of comments in JavaScript.
Examples include 1
// This is a single-line comment in JavaScript
2:
/*
This is a multi-line comment in JavaScript.
You can add detailed explanations here.
*/
How to write a multiline comment in JavaScript?
To write a multiline comment in JavaScript, use the /* */ syntax. It allows you to comment out multiple lines of code with ease.
How do you comment multiple lines?
To comment out multiple lines in React or JavaScript, use the /* */ syntax for multi-line comments. Wrap the code you want to comment between /* and */.
What is the shortcut to comment out multiple lines in React?
The shortcut to comment out multiple lines in React is Ctrl + / for Windows/Linux and Cmd + / for macOS when you have the lines selected.
How to write function comments in JavaScript?
To write function comments in JavaScript, use the /** … */ syntax for documenting functions. This is known as JSDoc.
For example:
/**
* Calculate the total price including tax.
* @param {number} subtotal – The subtotal amount.
* @param {number} tax – The tax rate.
* @returns {number} The total price.
*/
function calculateTotal(subtotal, tax) {
// Function code here
return total;
}
How do you comment out codes?
You can comment out code by using // for single-line comments or /* */ for multi-line comments. This temporarily disables the code without removing it.
What is the key for comment code?
The key for commenting code is Ctrl + / for Windows/Linux and Cmd + / for macOS. It allows you to quickly comment out selected lines of code.
What is commenting shortcut key?
The commenting shortcut key is Ctrl + / for Windows/Linux and Cmd + / for macOS. It’s a quick way to comment out or uncomment selected lines of code in most code editors.