Range extraction
sub range-extraction (*@ints) {
my $prev = NaN;
my @ranges;
for @ints -> $int {
if $int == $prev + 1 {
@ranges[*-1].push: $int;
}
else {
@ranges.push: [$int];
}
$prev = $int;
}
join ',', @ranges.map: -> @r { @r > 2 ?? "@r[0]-@r[*-1]" !! @r }
}
say range-extraction
-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20;
say range-extraction
0, 1, 2, 4, 6, 7, 8, 11, 12, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
37, 38, 39;
Output:
-6,-3-1,3-5,7-11,14,15,17-20
0-2,4,6-8,11,12,14-25,27-33,35-39
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