My experience is that programming books are - in many cases - completely redundant. SFML is really well documented, and the API reference has examples for quite a lot of the classes. There are also a lot of good tutorial, both on the webpage and on the github wiki for SFML.
And don't spend time copying the code in the book. Whenever you write something yourself, you are more involved in the process, and your memory will benefit from it. You may read a section ten times, but writing you own code once or twice may give more insights. Also, writing ready made code robs you of the experience of reading compiler errors. The more errors you make, the more you learn. You might pull out more hairs from your head, but you will be wiser in the end.