How To Use Comments in Ruby

How To Use Comments in Ruby: A Complete Guide

How To Use Comments in Ruby

If you’re unfamiliar with Ruby programming, you may be curious about what comments are and why they’re significant. Comments are lines of code that the Ruby interpreter ignores. They are used to describe what the code does, make it more understandable, and aid other programmers in understanding your code. In this essay, we will cover the use of Ruby comments.

Why Use Comments in Ruby?

Comments are an integral component of every programming language. They make it easier for you and other programmers to comprehend the purpose of a specific piece of code. Here are a few reasons for using comments in Ruby:

  • Comments make your code more readable
  • Comments explain the function of the code
  • If you need to review the code later, comments can assist you remember what it does. Comments can also help
  • other programmers understand your code.

How To Write Comments in Ruby

How To Use Comments in Ruby

Ruby comments are indicated by the # sign. The interpreter disregards anything following the # symbol on the same line because it is considered a comment. Here’s one instance:

# This is a comment

Moreover, comments can be made on separate lines. Here’s one instance:

# This is a comment
# This is another comment

It is essential to highlight that remarks should be expressed in simple English and be concise and direct. Avoid using excessively technical language or abbreviations that other programmers may not understand.

When To Use Comments in Ruby

Comments should be added anytime the code does not explain itself. These are some examples of when Ruby comments should be used:

  • When defining complicated algorithms
  • When you are writing difficult-to-read code
  • When changing existing source code
  • When programming in collaboration with others

It is essential to keep in mind that remarks should not be overused. If your code is self-explanatory, it may not require any comments.

Best Practices for Using Comments in Ruby

How To Use Comments in Ruby

These are some important practices to remember when utilizing Ruby comments:

  • Comment your code as you write it, not after the fact.
  • Be precise and concise.
  • Avoid using comments for obvious code explanations
  • Use comments to describe why you are doing something rather
  • than what you are doing.

Examples of Good and Bad Comments

To further show the best practices for using Ruby comments, let’s examine some good and bad examples of comments.

Example of a Good Comment:

# Calculate the sum of all elements in the array
sum = 0
array.each do |element|
sum += element

This comment clarifies why the function is adding the array’s elements, which may not be immediately apparent from the code alone. Also, it employs clear and short language, making it simple for other programmers to comprehend.

Example of a Bad Comment:

# This code does what it's supposed to do
sum = 0
array.each do |element|
sum += element

This comment is superfluous and adds no benefit to the code. It is evident from the code alone that the array elements are being summed, and the comment adds nothing that is not already apparent from the code.


In conclusion, Ruby code that is clear, succinct, and legible relies heavily on comments. When necessary, they should be used to explain what the code does and why it does it. By adhering to the best practices stated in this article, you may effectively use comments in your Ruby code and make it easier to comprehend for yourself and other programmers.

Remember to add comments to your code as you create it, to keep them succinct and to the point, and to update them whenever the code is modified. You can ensure that your code is easy to read, maintain, and collaborate on in this manner.

Additional Tips for Using Comments in Ruby

While the previously described best practices can help you properly use comments in your Ruby code, there are a few additional considerations to bear in mind:

1. Use comments to document your code

When working on a large project, it can be beneficial to provide comments that explain how the various components of the code interact. This can make it simpler for other programmers to comprehend the codebase and quickly catch up.

2. Use comments to leave notes for yourself

Remarks might also serve as personal reminders. Leave a remark in your code to remember yourself if you discover a better way to implement a given feature or if you think of a bug fix you want to implement later.

3. Avoid using comments to disable code

While comments can be used to temporarily disable code during development, version control techniques such as Git are generally preferable for managing code changes. Commented-out code can bloat your codebase and make it more difficult to manage over time.

4. Don’t be afraid to delete comments

As your codebase evolves, some comments may become obsolete or superfluous. Don’t be scared to delete comments that have lost their utility. This can assist maintain a clean and maintainable codebase.

Final Thoughts

Comments are vital to developing clean and understandable Ruby code. By correctly utilizing comments, you may make it easier for yourself and other programmers to comprehend your codebase and communicate more efficiently. Remember to add comments to your code as you create it, keep them succinct and to the point, and update them as your codebase evolves. Happy coding!

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