friends, neighbors, (over)laps
DB<106> sub friends (&@){
my $code=shift;
$last=$_;
my @result;
for (@_) {
push @result, $code->($last,$_);
$last=$_;
}
return @result;
}
DB<107> friends { $_[0]+$_[1] } 1..5
=> (1, 3, 5, 7, 9)
update
maybe "friendwise" in analogy to "pairwise" since "friend" is a noun
Cheers Rolf
( addicted to the Perl Programming Language)
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