New PDF release: Basic Lisp techniques

By Cooper D.J.

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32 CHAPTER 3. THE CL LANGUAGE In English, you might read this function to say “If the list is empty, return NIL. Otherwise, if the desired item is the same as the first of the list, return the entire list. ” Note that, for the purposes of any kind of logical operators, returning any non-NIL value is “as good as” returning T. So the possible return-values of the member function are as good as returning T or NIL as far as any logical operators are concerned. 8 Getting Part of a List Subseq is a common function to use for returning a portion of a list (or actually any type of Sequence).

THE LIST AS A DATA STRUCTURE 27 ((a 20) (b 30)) is not evaluated (actually, the macro has the effect of transforming this into something else before the CL evaluator even sees it). Because this assignment section is not evaluated by the let macro, it does not have to be quoted, like a list which is an argument to a function would have to be. As you can see, the assignment section is a list of lists, where each internal list is a pair whose first is a symbol, and whose second is a value (which will be evaluated).

The constructor function, make-pathname, takes keyword arguments corresponding to the six possible slots of the pathname. txt" As seen in the above example, the :directory slot is technically a list, whose first is a keyword symbol (either :absolute or :relative), and whose rest is the individual directory components represented as strings. 6 File Input and Output Doing file input and output in CL is essentially a matter of combining the concepts of streams and pathnames. You must first open a file, which entails associating a stream with the file.

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