Improve readability/simplicity of fcase() implementation
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Start by locating the fcase() implementation and the surrounding performance tests, if any. Read the implementation and identify the names or structure that make it hard to follow, then add performance regression coverage before attempting a refactor. Done means the implementation is simpler to understand without introducing performance regressions.
Written by the indexing model from the issue text.
Description
Basically LGTM. However, there are many things I would want to rename/remodel for clarity purposes. Right now, I find this piece of our codebase quite hard to grasp in comparison to its complexity.
Originally posted by @ben-schwen in https://github.com/Rdatatable/data.table/issues/4264#issuecomment-2255663877
A first step IMO is to add several performance regression tests. That way we can refactor with more confidence.
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