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Planet Lisp

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Title of Planet Lisp: "Planet Lisp"

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Classical literate programming

A literate program consists of interspersed narrative and code chunks. From this, source code to be fed to the compiler is generated by a process called tangling, and documentation by weaving. The specifics of tangling ...


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Zach Beane has released the latest Quicklisp beta (January 2026), and I am pleased to have contributed to this release. Here are the highlights:

dual-numbers — Implements dual numbers and automatic differentiation using dual numbers for Common Lisp. fold — FOLD-LEFT and FOLD-RIGHT functions. function — Provides higher-order functions for composition, currying, p...


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I did the Advent of Code this year using Common Lisp. Last year I attempted to use the series library as the primary iteration mechanism to see how it went. This year, I just wrote straightforward Common Lisp. It would be super boring to walk through the solutions in detail, so I've decided to just give some highlights here.

Day 2: Repeating Strings

Day 2 is easi...


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My ILsee program for viewing Interlisp source files is written in Common Lisp with a McCLIM GUI. It is the first of the


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