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The Power of Asynchronous JavaScript: Best Practices and Examples

11 April 2023

The Power of Asynchronous JavaScript: Best Practices and Examples

As a developer, writing code is only half the job. The other half is writing code that is easy to understand and maintain. One way to make code more readable and understandable is by adding comments. In this article, we will discuss the importance of code comments in JavaScript and provide some best practices for writing effective comments.

Why Are Code Comments Important?

Code comments are important for several reasons. First and foremost, they help other developers understand the purpose and functionality of the code. Comments explain how the code works, why certain decisions were made, and any potential issues or limitations.

Comments also make it easier to maintain and update the code. When code is well-commented, it's easier to identify and fix bugs, update functionality, and refactor the code without introducing new issues. Without comments, it can be difficult to understand the code's original purpose and intent, leading to mistakes and wasted time.

In addition, code comments can be used as a form of documentation. Documentation is important for code that is used by others, whether it's other developers, testers, or end-users. Comments provide a quick and easy way to understand how to use the code and what it does.

Best Practices for Writing Effective Code Comments

Now that we understand the importance of code comments, let's look at some best practices for writing effective comments in JavaScript.

  1. Use Clear and Concise Language

Code comments should be written in clear and concise language. Use simple language that anyone can understand, and avoid using technical jargon or overly complex terms. Write comments in a way that makes the code easy to understand, but don't over-explain or repeat what is already obvious from the code.

  1. Keep Functions Short and Focused

Functions should be short and focused, with a single responsibility. If a function is doing too much, it can be difficult to understand its purpose and functionality. When writing comments for functions, describe what the function does, what parameters it takes, and what it returns. Avoid commenting on how the function works, as this should be evident from the code.

  1. Use Comments to Explain Complex Logic

Comments can be used to explain complex logic or algorithms. If the code is doing something that is not immediately obvious, use a comment to explain what is happening and why. This can be especially useful for other developers who are not familiar with the code or the problem domain.

  1. Update Comments When Changing Code

Comments should be updated whenever the code changes. If the functionality of the code changes, the comments should be updated to reflect the new functionality. This ensures that the comments remain accurate and up-to-date, and helps other developers understand the changes that were made.

  1. Use a Consistent Comment Style

Consistency is important when it comes to writing code comments. Use a consistent comment style throughout the codebase, whether it's a block comment or an inline comment. This makes the code easier to read and understand, and helps developers identify important sections of the code.

In conclusion, code comments are an essential part of writing maintainable and understandable code. As the famous computer scientist Donald Knuth once said, "Programs are meant to be read by humans and only incidentally for computers to execute." By writing clear and concise comments, we can make code more readable and maintainable, saving time and effort in the long run.

So, don't forget to add comments to your JavaScript code! Use clear and concise language, keep functions short and focused, use comments to explain complex logic, update comments when changing code, and use a consistent comment style. Your fellow developers (and your future self) will thank you.

About the author: Daniel West
Tech Blogger & Researcher for JBI Training

+44 (0)20 8446 7555

[email protected]



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