Science Knowings: JavaScript Course For Social Media

Code Reviews

Code Reviews: A systematic way to improve code quality

Definition: Code reviews are a formal process where multiple developers examine and provide feedback on each other's code.

We'll discuss why code reviews are important, who should perform them, and how to conduct them effectively.

What are Code Reviews?

Code reviews are a collaborative process where developers review code written by their peers. The goal is to identify errors, improve code quality, and share knowledge.

Difference between Testing and Code Reviews

Testing focuses on verifying that code behaves as expected, while Code Reviews focus on evaluating code quality, design, and adherence to standards.

Why Incorporate Code Reviews?

Benefits of Code Reviews:

  • Improved code quality and reduced defects
  • Early detection of errors
  • Knowledge sharing and collaboration
  • Increased code maintainability
  • Improved developer skills

Who should perform the review?

Ideal candidates for code reviewers:

  • Developers with experience in the codebase
  • Developers with a strong understanding of coding standards
  • Developers who are familiar with the project's goals

When to do a Code Review?

Conduct code reviews:

  • Before merging code into the main branch
  • After significant changes to the codebase
  • Regularly as part of your development process

Preparation for Code Review

Before the review:

  • Run unit tests and fix any errors
  • Ensure your code meets coding standards
  • Write clear and concise commit messages

Types of Code Review

Common types of code reviews:

  • Design Review: Focuses on the architecture and design of the code
  • Peer Review: Involves a group of developers reviewing each other's code
  • Pair Programming: Two developers work together to write and review code

Advantages & Disadvantages of Design Review

Advantages of Design Review:

  • Improved code design and architecture
  • Early identification of potential issues
  • Increased understanding of the codebase
  • Disadvantages of Design Review:

    • Can be time-consuming
    • May not be suitable for all projects

Tips for giving effective feedback


  • Be specific and provide examples
  • Focus on the code, not the person
  • Suggest improvements rather than just pointing out errors


  • Use accusatory or blaming language
  • Make personal attacks
  • Ignore positive aspects of the code

Tips for receiving feedback gracefully


  • Read feedback carefully
  • Consider the reviewer's perspective
  • Thank the reviewer for their input
  • Make changes as necessary


  • Get defensive
  • Ignore feedback
  • Argue with the reviewer

Code Review workflow

Typical Code Review workflow:

  • Submit code for review
  • Reviewer examines the code
  • Reviewer provides feedback
  • Author addresses feedback and makes changes
  • Code is merged into the main branch

Common Mistakes

Common mistakes to avoid during code reviews:

  • Not taking the time to review code thoroughly
  • Focusing only on errors and ignoring positive aspects
  • Providing vague or unhelpful feedback
  • Being overly critical or dismissive
  • Ignoring the author's perspective

Tools & Resources for Code Reviews


  • Code review platforms (e.g., GitHub, GitLab, Jira)
  • Syntax checkers (e.g., ESLint, JSLint)
  • Testing frameworks (e.g., Jest, Mocha)
  • Resources:

    • Code Review Best Practices
    • How to Conduct Effective Code Reviews
    • Why and How to Perform Code Reviews

Next Up: Pair Programming

In the next session, we'll explore pair programming, where two developers work together to write and review code. Follow us to learn the benefits, challenges, and best practices of pair programming!