RosettaCodeData/Task/Executable-library/Sidef/executable-library-1.sidef

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func hailstone(n) {
gather {
while (n > 1) {
take(n)
n = (n.is_even ? n/2 : (3*n + 1))
}
take(1)
}
}
 
if (__FILE__ == __MAIN__) { # true when not imported
var seq = hailstone(27)
say "hailstone(27) - #{seq.len} elements: #{seq.ft(0, 3)} [...] #{seq.ft(-4)}"
 
var n = 0
var max = 0
100_000.times { |i|
var seq = hailstone(i)
if (seq.len > max) {
max = seq.len
n = i
}
}
 
say "Longest sequence is for #{n}: #{max}"
}