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Swift Functional Programming - Second Edition by Dr. Fatih Nayebi

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Declarative design

The overall intent of the aforementioned patterns is to cultivate a declarative design. As witnessed, FP is inherently more declarative, and therefore more accommodating in this regard. Through declarative design, we can distill the distinguishing characteristics of the domain better and reduce or eliminate coupling to orthogonal concerns of infrastructure. Consequently, re-usability, testability, correctness, maintainability, and productivity are tremendously enhanced.

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