A pull request isn't just the responsibility of the author, but also the reviewer. In this article, I'll be sharing 8 tips on giving effective code reviews.

1. Practice conventional comments

I've been practicing conventional comments for around 6 months. I find it to be a good practice. Here are a few reasons.

1. The intention of our comment is clear
2. The separation between the topic of the comment and the example and / or reasoning of the comment is clear
3. The author knows what they should prioritise on because our comments are well-labelled

2. Suggest changes by masking them as questions

When we mask our suggestions as questions, they can be thought-provoking to the author and the tone of our suggestion is highly likely to come across as friendly. Here are a few examples.

1. What if we rename this boolean variable from invitationAccepted to hasUserAcceptedInvitation? hasUserAcceptedInvitation is more clearer than invitationAccepted.
2. Since we're doing ${address.city}, ${address.country} more than once throughout these files, how about moving this combining of city and country into the Address class?

3. Add an example in our suggestion

Adding an example in our suggestion can be more beneficial than leaving just a reason. An example coupled with a reason might just give the author a eureka moment. 💡

4. Replace 'you' with 'we'

The effect of using 'we' instead of 'you' with people that know us well may not be significant, but with people we've not worked with before, it can provide a psychological difference, especially to those new to the industry. It can make them feel welcomed and makes the code review feel like a learning session.

5. Mind your nitpicks

Some nitpicks are necessary, but some of them are not. A code review filled with unnecessary nitpicks can affect the author's self-esteem and might even make us look unkind. How do we decide when to nitpick?

I suggest asking ourselves whether the code we're reviewing is misleading.

Is there a typo on user-facing content or a variable with a misleading name? If there is, it is a necessary nitpick.

Is our suggestion purely a stylistic change that makes no positive difference in readability? If it is, then it is an unnecessary nitpick.

But what if we want to enforce a convention within the codebase such as using double-quoted strings?
Then this should be taken care of by a linter. In JavaScript, there is ESLint. In Ruby, there is RuboCop.

6. If you're reviewing code, dedicate some time for it, don't rush

Reviewing code is also a part of the job. When we do our code review in haste, it's easy for sneaky bugs to slip through. If you're in a rush, I suggest doing the code review later if it's not urgent.

7. Use emojis and GIFs!

Most of the time, we communicate with the author of the pull request through text. It's easy for them to misinterpret our comments negatively, especially if we don't know each other well. Using emojis and GIFs can keep the atmosphere warm. Though please avoid leaving sarcastic emojis or GIFs because sarcasm doesn't transfer well through text. 😁

8. Leave a summary when necessary

Sometimes, we encounter some code that are similar and require similar changes. We shouldn't be leaving the same comment more than a few times as it can make the author feel overwhelmed. Instead, leave a summary. Here's an example.

The rest looks good to me! Just a few minor suggestions.

1. Link to code block A
2. Link to code block B
3. Link to code block C
4. Link to code block D

These blocks of code are doing the same thing. How about creating a reusable method?

Summary

When we review code, the objective isn't just to tidy up code and then merging the pull request for the sake of keeping a project moving. A code review is also a place for learning. Not just for the author, but also for the reviewer. Making ourselves approachable is one way of making code review a fun process.

If you find this article helpful, please spread the word! If you're looking for tips on opening effective pull requests, this article is just for you!

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Thanks for reading! ✌️