Uploaded February 2026 | Updated September 2026, 3 weeks ago

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At least in English, the word "purity" is a loaded word with connotations that leads some people into over-indexing on it when they first get into functional programming.

An excerpt from the Haskell for Dilettantes lesson "Beyond Purity" - youtu.be/k6owk9-lQEE

The painting behind the title page is "Tintoretto Paints His Dead Daughter", by Henry O'Neil.