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Introduction Functional programming is a programming paradigm that focuses on functions as primary building blocks, and immutable data as primary inputs and outputs. Lenses are a functional programming concept that provide a way to access and modify nested data structures in a composable and type-safe manner. In this post, we will explore what lenses are, and how to use them in Swift. We will start with the basics of functional programming, move on to lenses, and then delve into some advanced to...