Purely functional

（重定向自Pure functional language）

In computing, an algorithm, data structure, or programming language is called purely functional if they guarantee the (weak) equivalence of call-by-name, call-by-value and call-by-need evaluation strategies. One typical approach to achieve this is by excluding destructive modifications (updates) of entities in the program's running environment. According to this restriction, variables are used in a mathematical sense, with identifiers referring to immutable, persistent values.

单词	Pure functional language
释义	Pure functional language 英语百科 Purely functional （重定向自Pure functional language） In computing, an algorithm, data structure, or programming language is called purely functional if they guarantee the (weak) equivalence of call-by-name, call-by-value and call-by-need evaluation strategies. One typical approach to achieve this is by excluding destructive modifications (updates) of entities in the program's running environment. According to this restriction, variables are used in a mathematical sense, with identifiers referring to immutable, persistent values.
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