By Sampaio A.
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Initially released in 1981, this was once the 1st textbook on programming within the Prolog language and remains to be the definitive introductory textual content on Prolog. although many Prolog textbooks were released in view that, this one has withstood the try of time due to its comprehensiveness, instructional technique, and emphasis on common programming functions.
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Extra resources for An algebraic approach to compiler design
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.