By Cooper D.J.

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If you want to group multiple expressions together to occur as part of the then-form or the else-form, you must wrap them in an enclosing block. Progn is commonly used for this purpose. 1). 2 When In some ways, when is similar to if, but you should use when in cases where you know that the else-clause is simply NIL. This turns out to be a common situation. ")) NIL (Note that the database functions above are examples only and are not pre-defined in CL). 3 Logical Operators The Logical Operators and and or evaluate one or more expressions given as arguments, depending on the return-values of the expressions.

24 CHAPTER 3. 3, if you want a literal symbol itself, one way to achieve this is to “quote” the symbol name: ’a Another way is for the symbol to appear within a quoted list expression: ’(a b c) ’(a (b c) d) Note that the quote (’) applies across everything in the list expression, including any subexpressions. Lists Lisp takes its name from its strong support for the list data structure. The list concept is important to CL for more than this reason alone — lists are important because all CL programs themselves are lists!

This list may now be accessed as a normal list data structure1 . Common Lisp defines the abbreviation ’ as a shorthand way to “wrap” an expression in a call to quote. 4 Fundamental CL Data Types Common Lisp natively supports many data types common to other languages, such as numbers, strings, and arrays. Native to CL is also a set of types which you may not have come across in other languages, such as lists, symbols, and hash tables. In this overview we will touch on numbers, strings, symbols, and lists.

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