Functional programming: Difference between revisions

Revision as of 02:26, 12 July 2025

Revision as of 09:41, 29 July 2025

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In [[C Sharp (programming language)|C#]], anonymous classes are not necessary, because closures and lambdas are fully supported. Libraries and language extensions for immutable data structures are being developed to aid programming in the functional style in C#.

Many [[Object-oriented programming|object-oriented]] [[Design pattern (computer science)|design patterns]] are expressible in functional programming terms: for example, the [[strategy pattern]] simply dictates use of a higher-order function, and the [[visitor (design pattern)|visitor]] pattern roughly corresponds to a [[catamorphism]], or [[fold (higher-order function)|fold]].

Similarly, the idea of immutable data from functional programming is often included in imperative programming languages,<ref>{{cite book |title=Effective Java |edition=Second |first=Joshua |last=Bloch |chapter=Item 15: Minimize Mutability |isbn=978-0321356680 |date=2008 |publisher=Addison-Wesley |url-access=registration |url=https://archive.org/details/effectivejava00bloc_0}}</ref> for example the tuple in Python, which is an immutable array, and Object.freeze() in JavaScript.<ref>{{Cite web|last=|first=|date=|title=Object.freeze() - JavaScript {{!}} MDN|url=https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze|access-date=2021-01-04|website=developer.mozilla.org|quote=The Object.freeze() method freezes an object. A frozen object can no longer be changed; freezing an object prevents new properties from being added to it, existing properties from being removed, prevents changing the enumerability, configurability, or writability of existing properties, and prevents the values of existing properties from being changed. In addition, freezing an object also prevents its prototype from being changed. freeze() returns the same object that was passed in.}}</ref>