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Andrea Piseri looks at how array languages like APL implement scans over packed boolean arrays, where a naive loop manages about 0.6 elements per cycle. Using truth-table symmetries, the essay shows that fast versions of just and, less-than and xor are enough to derive good implementations of every other boolean scan, with bit-twiddling implementations in an appendix.
14 min · 3,251 words
ConcurrentML: Improving on Go's concurrency model
Nikhil explores Concurrent ML-style first-class events as a richer concurrency model than Go's channels alone: wrapping and composing communication operations, selective choice, guard events, and cancellation, with Racket ConcurrentML as the reference and notes on how Go falls short.
28 min · 6,476 wordsagent-assisted
Daniel Temkin's Folders is an esolang where programs are encoded purely as nested directory structures—no file contents required—updated for 2026 among his Forty-Four Esolangs.
4 min · 820 words
FAQ: Why isn't mutable a subtype of immutable, or vice versa?
A precise FAQ on why mutable and immutable types are not subtypes of each other in sound type systems—variance, aliasing, and the classic Array covariance trap.
5 min · 1,195 words