I'm looking for a way to modify a property value in a property list by multiplying it with a given factor similar to using incf for adding to a value. With incf I could say: (let ((seq '(:x 10 :...

Is a setfable the same as a place in CLHS and a location in Norvig's PAIP? I'm trying to figure out what exactly a place is in Common Lisp but to me the HyperSpec's explanation place n. 1. a fo...

Here's the thing: I don't "get" setf-expanders and would like to learn how they work. I need to learn how they work because I've got a problem which seems like a typical example for why you should...

In Practical Common Lisp chapter 17. Object Reorientation: Classes section Accessor Functions, I was finding it difficult understanding the way SETF is being extended. The functions: (defun (setf...

I know that when you want to make a dynamic/global binding in Lisp, you use either defparameter or defvar. I also know that you can make lexical bindings, well, almost everywhere, using defun argum...