How to debug d3.js transition?

@dalton_moen 

To debug a D3.js transition, you can follow these steps:

1. Use the browser's developer tools: Open your browser's developer tools and check the console for any error messages or warnings that might indicate issues with your transition.
2. Print out values: Add console.log statements in your code to print out the values of variables at different points in the transition. This can help you identify any unexpected changes in values that might be causing problems.
3. Check for typos or syntax errors: Make sure that all your code is free of typos and syntax errors. Double-check all your method calls, variable names, and attribute values to ensure they are correct.
4. Break down the transition: If you have a complex transition, try splitting it into smaller parts and running them individually to isolate the issue. This can help you pinpoint where the problem is occurring.
5. Use the debugger: Set breakpoints in your code using the browser's debugger and step through the transition to see how each step is being executed. This can help you identify the exact point where things are going wrong.
6. Refer to the D3.js documentation: If you are still having trouble, refer to the D3.js documentation and examples to see if there are any tips or tricks that can help you debug your specific issue.

By following these steps, you should be able to effectively debug your D3.js transition and identify any issues that may be causing it to not work as expected.