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I am working my way into learning a bit of Scheme (actually, Racket) with the help of a few practical problems to solve. In this case, I want to split a flat list of symbols at a certain delimiter symbol, discarding it and returning the list of splitted chunks.

So, here is my solution:

it does work, but I feel it's not the best way to accomplish the task, for a couple of reasons:

Also, the whole point of this excercise is learning, so please don't tell me I should use string-split or regex-split or the like. I am aware of their existence.

I am working my way into learning a bit of Scheme (actually, Racket) with the help of a few practical problems to solve. In this case, I want to split a flat list of symbols at a certain delimiter symbol, discarding it and returning the list of split chunks.

It does work, but I feel it's not the best way to accomplish the task, for a couple of reasons:

Also, the whole point of this exercise is learning, so please don't tell me I should use string-split or regex-split or the like. I am aware of their existence.

• The (loop (let (... part seems a bit clunky, maybe even unnecessary.
• The (list-tail ... clause entails rescanning the list for nextpos elements, which obviously is not optimal. In Python, I would have split-one return the current chunk and a reference to the head of the following, i.e. the cdr of the last element to be considered, and keep iterating from that. Here I'm uncertain at what to do.

• The (loop (let (... part seems a bit clunky, maybe even unnecessary.
• The (list-tail ... clause entails rescanning the list for nextpos elements, which obviously is not optimal. In Python, I would have split-one return the current chunk and a reference to the head of the following, i.e. the cdr of the last element considered, and keep iterating from that. Here I'm uncertain at what to do.