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The procedural method:
$balance = add_to_acct($balance, $amount);
...
The OOP method:
my $acct_obj = new BankAccount($initial_balance);
$acct_obj->add_to_acct($amount);

add_value($x);
add_value($y);
add_value($z);
my @all_values = get_all_values;

@all_values = add_value($x, @all_values); 
# gives the list to add to, and takes the newly added list # as a retu
+rn value
@all_values = add_value($y, @all_values); 
...
# Now anytime you inspect @all_values, it has the currently # added el
+ements.