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Functional programming is a paradigm which attempts to solve computational problems by the chained evaluation of functions whose output is determined by their inputs rather than the programme state. In this style of programming, side effects and mutable data are deprecated and usually strictly isolated.

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What are the correct functional programming terms for what I'm doing here?

I recently needed a function to deep clone an object. I started with the code given as an accepted answer to this question: https://stackoverflow.com/a/728694/1253156 However, our SonarQube complaine …