By Christine Hooghe
ISBN-10: 2215074620
ISBN-13: 9782215074625
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Example text
The cost of writing or maintaining a program increases with its length. ◦ All other things being equal, the shorter program is the better. From this point of view, the writing of utilities should be treated as a capital expenditure. By replacing find-books with the utility find2, we end up with just as many lines of code. But we have made the program shorter in one sense, because the length of the utility does not have to be charged against the current program. It is not just an accounting trick to treat extensions to Lisp as capital expenditures.
The function remove-if-not, which collects all the elements of a list satisfying some predicate, was defined by individual programmers for years before it became a part of Common Lisp. 1 BIRTH OF A UTILITY 41 Learning to write utilities would be better described as learning the habit of writing them, rather than the technique of writing them. Bottom-up programming means simultaneously writing a program and a programming language. To do this well, you have to develop a fine sense of which operators a program is lacking.
The rotatef macro rotates the values of any number of generalized variables—that is, expressions you could give as the first argument to setf. When applied to just two arguments, the effect is to swap them. 2 shows a function which returns reversed lists. With good-reverse, we get the reversed list as the return value; the original list is not touched. 2: A function to return reversed lists. It used to be thought that you could judge someone’s character by looking at the shape of his head. Whether or not this is true of people, it is generally true of Lisp programs.
Parures de perles : Plus de 60 bijoux en perle de rocaille by Christine Hooghe
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