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th particular details and prudent mentorship.
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Extra resources for Common Lisp Recipes: A Problem-Solution Approach
Sample text
You’d usually use GENSYM with a prefix so that you can later make sense of the macro’s expansion; a variable name like #:HEIGHT123 is certainly more meaningful than #:G123. What all of these methods have in common is that they create a fresh symbol on each invocation, which means that if you invoke them twice to create two symbols with the same name, the symbols will nevertheless be different:15 CL-USER > (make-symbol "FOO") #:FOO CL-USER > (make-symbol "FOO") #:FOO CL-USER > (eql * **) 10 You could, for example, use FIND-SYMBOL or INTERN directly.
If a language is always case sensitive (as are J AVA and other C-syntax languages), then it makes sense to use the so-called “CamelCase” convention to name objects, but for Lisp it is nonsense, so don’t do it. ) An alternative (also common in many programming language cultures) is to use the underline character to separate words as in rocket velocity. That’s not as bad as the CamelCase variant, but arguably it’s also not as good as the Lisp-y way to use hyphens as in rocket-velocity. The underline is used in languages that can’t use hyphens in identifiers.
It just looks different. Specifically, what we could once refer to by the character sequence TEST can no longer be reached this way. Instead, if we now type TEST, we’re referring to another symbol instead. , how the system displays it and what we have to type to access it), but what we’ve just done shows that this is wrong! The character sequence TEST denoted different symbols at different times. 21 The process of uninterning symbols should be viewed as a maintenance measure which can potentially be dangerous.