Functional Programming in C#—A Brief Consideration

The post presents functional programming as an alternative for handling high complexity in code and says C# now offers several features that support it. It describes functional programming as a declarative style built from functions, then explains pure functions, immutable types, expressions instead of declarations, LINQ, and higher-order functions as practical ways to write more cohesive code in C#.

It also says functional programming does not replace object-oriented programming. The article frames both as useful together and advises using pure functions and other functional tools where they fit rather than trying to make every program fully functional.

Reading notes

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• Functional programming is presented as a declarative paradigm that composes functions instead of relying on imperative state changes.
• Pure functions are described as functions that always return the same result for the same inputs and are less affected by mutable state or side effects.
• The post says pure functions can make code easier to understand, debug, and test.
• It also lists drawbacks such as a higher learning curve, more processing in some cases, and extra code for copying values into new objects.
• C# is described as an object-oriented language that still supports functional programming, especially through LINQ and lambda expressions.
• The article shows immutable types as a way to avoid state changes by returning new instances instead of modifying existing ones.
• It recommends using expressions instead of declarations when possible to reduce complexity.
• LINQ is presented as a functional-style feature of C# with query and lambda forms.
• Higher-order functions are defined as functions that take a function as an argument or return one.
• The post concludes that functional programming complements object-oriented programming and should be used where it fits.