You can speed that up by making a hash of the reference array and testing for existence of keys.

my %search;
@search{@DB} = ();
for (@Input) {
    print exists $search{$_}   ?
          "$_ : Found $_\n"    :
          "$_ : Not Found $_\n";
}

[download]

Does your @DB come from a relational database? It may be a better design to let the rdbm do the work by constructing a query on your inputs.

Update: The ?: operator is called the trinary op in perlop. It is like if..else.. but it returns a value, which is what's getting printed here. Syntax is condition ? if-value : else-value. A cool but little-used property of trinary is that it's an lvalue: 

$invert ? ($true, $false) : ($false, $true) = (0, 1);

[download]
I think it's little used because there's not much call for it in well-designed code. Trinary is a borrowing from C.

After Compline,
Zaxo

In reply to Re: searching 2 arrays by Zaxo
in thread searching 2 arrays by Anonymous Monk

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