Transforms can be stateless or stateful. A stateless transform is just a function that takes chunks and returns transformed chunks:
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The writer has a simple interface: write(), writev() for batched writes, end() to signal completion, and abort() for errors. That's essentially it.
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But more than that, they taught me how much more fun it was to learn by playing with an interactive, dynamic program instead of passively reading about concepts in a book. […]