{
my %data;
@data{@data} = 1; # turn @data into a lookup hash
foreach ( @data2 ) {
print "This $_ was not found.\n"
if not exists $data{$_}
}
}
Update: An aside with MeowChow has convinced me that
@data{@data} = undef; # turn @data into a lookup hash
is less misleading. As with the "= 1" form above, only the value for the first key is set, and all remaining values are set to undef. Since we're just using the hash as a way to trade time for space in detecting the presense of keys, values don't matter. But the originally was slightly misleading nonetheless.
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