Notes on Haskell Programming (Part 137): An optimized way to generate Pandoc's document structure

Generated by NotebookLM based on this blog post:
https://www.kianmeng.org/2026/05/notes-on-haskell-programming-part-136.html
This technical guide explores a method for improving performance when generating documents via the Pandoc API by shifting from document-level merging to monadic block fusion. The author argues that the initial approach of creating and discarding entire document structures for every token was inefficient, advocating instead for combining individual content blocks before wrapping them in a final metadata layer. This refactoring leverages the lazy evaluation of the Haskell compiler, which defers processing until necessary to avoid unnecessary memory overhead. Furthermore, the text highlights how stream fusion allows the compiler to transform multiple data passes into a single, high-performance loop, effectively eliminating intermediate data structures. Ultimately, the piece serves as a practical lesson in choosing the correct monoidal identity to ensure that code remains both readable and computationally lean.

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