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class List is also {
multi method fmt($format = '%s', $sep = ' ', $lastsep = $sep) {
my $result = '';
my $index = 0;
for self.list -> $elem {
$result ~= do given $index++ {
when 0 { }
when self.end { $lastsep }
when * { $sep }
};
$result ~= sprintf($format, $elem);
}
$result;
}
}
say <huey dewey louie>.fmt('%s', ', ', ', and ')
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