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In computer programming, a pure function is a function that has the following properties:[1][2]
- the function return values are identical for identical arguments (no variation with local static variables, non-local variables, mutable reference arguments or input streams, i.e., referential transparency), and
- the function has no side effects (no mutation of non-local variables, mutable reference arguments or input/output streams).
- ^ Bartosz Milewski (2013). "Basics of Haskell". School of Haskell. FP Complete. Archived from the original on 2016-10-27. Retrieved 2018-07-13.
- ^ Brian Lonsdorf (2015). "Professor Frisby's Mostly Adequate Guide to Functional Programming". GitHub. Retrieved 2020-03-20.
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