PFfPL is a great book. It manages to present many seemingly different language features in a surprisingly unified way. It's very opinionated at times (usually

PFfPL is a great book. It manages to present many seemingly different language features in a surprisingly unified way. It's very opinionated at times (usually against anything "dynamic", eg. typing and binding ;) ) but I think it's worth it for the clarity that it allows. Of course, Bob Harper has the clout to back up those opinions!