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code-complexity
Measure the churn/complexity ratio. Higher values mean hotspots where refactorings should happen.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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In my years as a software engineer, I have probably looked at hundreds of codebases. Too many to count. I struggled a lot with understanding where the relevant code is most of the time. Normally, asking for help what I should look for and guidance in tickets will bring me forward. Slowly and surely I will understand what the code is doing. And you will too. Some people are better at this and some people will be slow. No shame. Most code is complex. But I found a simple tool that will make it easier for you. It is called code-complexity and you can use it as the following code snippet shows:
With long functions normally there comes large files as well. People tend to put everything into one file if they also put a lot into one function. So in theory we could take the lines of code as a measurement as well. There are a lot of utility packages out there that solve this problem. One of these tools is called sloc. It will output the number of lines of code within a file. But do not use it directly. The tool I mentioned before includes this by default.
Blitz.js is a framework built on top of Next.js. It describes itself as the Ruby on Rails for JavaScript/TypeScript. The team is working for more than a year on this framework and it would be quite interesting to see where the core of their logic is being placed.
The tool code-complexity is closely coupled to JavaScript and TypeScript-based codebases. For other languages like Java, C#, Python, or PHP there are other tools, but one tool that is generic and works for most of the codebases is code-maat. It is a tool created by the author of the book mentioned in the chapter before.