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Side effect (computer science)
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== Referential transparency == {{Main|Referential transparency}} Absence of side effects is a necessary, but not sufficient, condition for referential transparency. Referential transparency means that an expression (such as a function call) can be replaced with its value. This requires that the expression is [[pure function|pure]], that is to say the expression must be [[deterministic algorithm|deterministic]] (always give the same [[value (computer science)|value]] for the same input) and side-effect free.
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