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A strict programming language is a [[programming language]] which employs a strict [[programming paradigm]], allowing only [[strict function]]s (functions whose parameters must be evaluated completely before they may be called) to be defined by the user. A non-strict programming language allows the user to define non-strict functions, and hence may allow [[lazy evaluation]].{{Sfn|Scott|2006|p=541}}
Non-strictness has several disadvantages which have prevented widespread adoption:{{Citation needed|date=April 2024}}
* Because of the uncertainty regarding if and when expressions will be evaluated, non-strict languages generally must be [[purely functional language|purely functional]] to be useful.
* All [[computer architecture|hardware architecture]]s in common use are optimized for strict languages, so the best compilers for non-strict languages produce slower code than the best compilers for strict languages.
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