Function Calls in Strings

        use Eval;
        print "Next year, I will make $Eval{$SALARY*1.06} dollars\n";

• %Eval is a tied hash, so the FETCH method is called:

        sub FETCH { $_[1] }     #  Identity function

• It is called with the argument "47700"

• It then returns "47700" as the value 'stored' in the hash

• Result:

        Next year, I will make 47700 dollars

• Or if you prefer:

        print "The square root of 2 is $Eval{sprintf("%.4f", sqrt(2))}\n";

        print "The employee's name is $Eval{$employee->name}\n";

• Andrew Pimlott invented this trick

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Copyright © 2001 M. J. Dominus