From ca3907431bfde5aa0715945222ce777d72e6b411 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 2 Mar 2024 16:16:51 +0100
Subject: Docs & samples

---
 samples/rosetta/hailstone.bruijn | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 samples/rosetta/hailstone.bruijn

(limited to 'samples/rosetta/hailstone.bruijn')

diff --git a/samples/rosetta/hailstone.bruijn b/samples/rosetta/hailstone.bruijn
new file mode 100644
index 0000000..46cf8a2
--- /dev/null
+++ b/samples/rosetta/hailstone.bruijn
@@ -0,0 +1,21 @@
+:import std/Combinator .
+:import std/List .
+:import std/Math M
+:import std/Number/Binary .
+
+# hailstone sequence using binary shifts
+hailstone y [[(0 =? (+1b)) {}0 go]]
+	go 0 : (=²?0 (1 /²0) (1 (↑¹0 + 0)))
+
+# --- tests ---
+
+seq-27 hailstone (+27b)
+
+:test (∀seq-27) ((+112))
+:test (take (+4) seq-27) ((+27b) : ((+82b) : ((+41b) : {}(+124b))))
+:test (take (+4) <~>seq-27) ((+1b) : ((+2b) : ((+4b) : {}(+8b))))
+
+all-below-100000 [0 : ∀(hailstone 0)] <$> seq
+	seq take (+1000) (iterate ++‣ (+1b))
+
+main [head (max-by (M.compare ⋔ tail) all-below-100000)]
-- 
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