Common Lisp Recipes: A Problem-Solution Approach by Edmund Weitz

By Edmund Weitz

This booklet is a suite of recommendations to difficulties and solutions to questions you are going to come across while writing real-world functions in universal Lisp. Written by means of an writer who has used universal Lisp in lots of winning advertisement tasks over greater than a decade, this ebook covers parts as diversified as internet programming, databases, graphical person interfaces, integration with different programming languages, multi-threading, and cellular units in addition to debugging innovations and optimization, to call quite a few. it's also the 1st universal Lisp ebook to take on such complicated themes as setting entry, logical pathnames, grey streams, supply of executables, beautiful printing, setf expansions, or altering the syntax of universal Lisp.
The booklet is equipped round particular difficulties or questions each one by way of ready-to-use instance strategies and transparent reasons of the techniques concerned, plus tips that could choices and additional information. each one recipe may be learn independently of the others and therefore the ebook will earn a distinct position in your bookshelf as a reference paintings you usually are looking to have inside reach.
Common Lisp Recipes is aimed toward programmers who're already accustomed to universal Lisp to a definite quantity yet don't but have the adventure you usually merely get from years of hacking in a particular desktop language. it's written in a mode that combines hands-on no-frills pragmatism wi

th particular info and prudent mentorship. 

If you are feeling interested in universal Lisp's mixture of breathtaking beneficial properties and down-to-earth utilitarianism, you will additionally like this book.

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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.

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