posted 9 years ago
Hi, i have a question about an exercice found in K&B book and a little bit modified to understand how this class works :
this is the output :
{f=fig, p=pear}
{f=fig, p=pear}
{a=apple, d=date}
{a=apple, d=date, f=fig}
My question is why when we put the true in tailmap does not have any effect
and when we put in headmap if it's true the f is added otherwise it's not
Thanks and Best regards