I understand wanting to use map or filter when things get more complex. Pandas has filter and apply methods for that. I agree that the JS versions are quite nic

I understand wanting to use map or filter when things get more complex. Pandas has filter and apply methods for that. I agree that the JS versions are quite nice with the arrow functions and method chaining. But for simpler operations, if you're doing a lot of vector computations, then map and filter bloat the code considerably when the mathematical notation is easy to read. Good luck with work on the JS implementation and efficiency comparisons. Pandas utilizes a Series object built on top of NumPy array for handling columns and rows. I don't know whether a similar approach would be helpful in JS.