Hailstone sequence: Difference between revisions

=={{header|Bruijn}}==

<syntaxhighlight lang="bruijn">

: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))))

below-100000 [0 : ∀(hailstone 0)] <$> seq

seq take (+99999) (iterate ++‣ (+1))

main [head (max-by (M.compare ⋔ tail) below-100000)]

</syntaxhighlight>