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::What are these side-effects? In Common LISP and other versions sure there are side-effects, and in fact there are many things which make Lisp actually imperative. However, in pure Lisp, which is a true functional language, then I can not think of any side-effects. When you use a subroutine to simply return a single value, then it is considered a function. The term function is not defined by what languages have made functions and then expanded to make something different than functions. It is a term in programming originated from subroutines that are true functions, as in like mathematical functions. Programming languages on computers are no stronger than recursively enumerable langauges which can be enumerated according to recursive functions, which are highly "mathematical". Basically, I am saying every program could be written as a set of mathematical functions (it may be a huge list of them, but it is possible - you learn this in the study of formal languages). -has
:If you consider "Lisp" as a Platonic ideal, you can make it have whatever properties you like. But real Lisp allows side effects and Lisp programmers routinely make use of them. Therefore the mathematical functions in a typical Lisp program do not line up with the language's functions. [[User:Gazpacho|Gazpacho]] 05:38, 27 October 2005 (UTC)
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