# An algebraic approach to compiler design by Sampaio A.

By Sampaio A.

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Which of the two you use should depend on which intention you want to convey to the reader of your code. 36 2-2. Creating Lists 2-2. Creating Lists Problem You want to create lists without constructing them from individual conses. Solution Well, of course nobody uses CONS to construct lists as we did in Recipe 2-1. There are actually a lot of different ways to create lists. To begin with, here are the most common ones: CL-USER> (list 1 2 3) (1 2 3) CL-USER> (list 1) (1) CL-USER> (list) NIL CL-USER> (list 1 2 (list 3 4)) (1 2 (3 4)) CL-USER> (list* 1 2 (list 3 4)) (1 2 3 4) CL-USER> (make-list 4 :initial-element 42) (42 42 42 42) CL-USER> (make-list 4) (NIL NIL NIL NIL) But there’s more.

27 See 20 Recipe 1-1 for a more detailed explanation of the terms external, accessible and present. 1-8. Understanding C OMMON L ISP’s Case (In)Sensitivity Note that for all of these iteration constructs, it is possible that you’ll come across the same symbol more than once. Again, see the HyperSpec for more information. 1-8. Understanding Common Lisp’s Case (In)Sensitivity Problem If you type :foo into the REPL, it will reply with :FOO, so C OMMON L ISP is obviously case insensitive, isn’t it?

Jpg", no matter what the current image directory is. 22 But 16 note the quote sign. 1-6. ” For example, if RESOURCE-INFORMATION were a place (see Recipe 10-8), then a form like (setq %pics-dir% #p"/tmp/") would be expanded into this: (setf (resource-information :type :directory :data :images) #p"/tmp/") There’s also a “local” variant called SYMBOL-MACROLET, which is to DEFINE-SYMBOLMACRO what MACROLET is to DEFMACRO. One burden that symbol macros don’t take off your shoulders is the decision on whether their usage is actually a good idea in terms of style.