Automated Code Review Vs Manual Code Review
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- Published date: February 13, 2020
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- Pune, Pune, Maharashtra, India
In a Manual Code Review (MCR), the source code is read line by line to check for possible vulnerabilities. This involves a lot of skills, experience, and patience. The issues or errors discovered in this review will greatly help to increase the efficiency of the firm.
With an Automated Code Review (ACR), there is a set of predefined rules that are determined for the code to comply with. Software tools provide assistance in ACR that displays a list of warnings that are in violation of programming standards.
So how to decide which works best for you? Here’s a comparison that we thought would help you make this decision.
Differences Between Manual & Automated Code Review
MCR — Because the user reads every single line of the code, it is easy to gather the intentions of the developer. But even if that is the strength, it takes a lot of time to look and read these codes line by line.
ACR — No wonders it’s fast! Automation software can read thousands of lines of code very swiftly. But these lack the skills of identifying the business logic and the intentions of the developer.
MCR — This method is very useful in crossing the rarely visited code paths. Few techniques such as penetration testing examine paths that have inputs fed, but lesser-traveled paths or hidden paths can be missed. But a rigorous manual code review is better in identifying these paths that are misunderstood by automated tools.
ACR — These intentionally hidden paths can also be easily explored by automation tools that are much more sophisticated but the automated code review can miss the intentions behind these.
3) Subtle Mistakes:
MCR — Because the reviews are done by reviewers on an individual basis, it is very possible that the human eye can miss a few vulnerabilities that are related to integration or other isolated problem.
ACR — These mistakes and small errors that are missed in manual reviewing are easily caught by automated systems. However, this automation cannot go beyond a particular limit of reviewing which can be done by manual code review.
MCR — Having trained and skilled engineers to handle an efficient manual code review comes attached to its obvious costs. It takes years of experience before a reviewer is able to adequately able to manage reviews.
ACR — It isn’t necessary for reviewers to have the entire knowledge and skills of reviewing. The automation software is programmed to issue warnings of potential errors.
Both these methods of review have their own pros and cons. Thus we understand the difficulty in choosing which one to go ahead with. Generally, the trend is now shifting towards automated code review because of time, cost and effort but still, many companies prefer to have a human touch to it.
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