Web Reference: Jul 23, 2025 · In this article, we will see the concepts of pure and impure functions in JavaScript, along with understanding their differences, & basic implementation for a better understanding of the concepts. Jun 29, 2023 · Pure functions provide predictability, testability, and composability, while impure functions introduce side effects and dependencies on external state. A side effect occurs in a program whenever you use external codein your function — which, as a result, impacts the function’s ability to perform its task. So what exactly does this mean? Let's see with some examples.
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