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Functional Programming is getting a lot of attention due to the advantages it offers like parallelism, easier testing, predictability and many others. Today I am going to talk about how to design Pure Function and help you understand the benefits of pure function.Pure functions are a concept mainly used in functional programming languages but it can be applied in any programming paradigm. Pure functions are easy to combine together into simple solutions. They are easier to test and debug than impure functions. They can also be used to cache and reuse the result of a computation.