Expression problem: Difference between revisions

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{{Short description|Data abstraction problem in programming languages}}

The '''expression problem''' is a challenging problem in [[programming language]]s that concerns the extensibility and modularity of statically typed data abstractions. The goal is to define a data abstraction that is extensible both in its representations and its behaviors, where one can add new representations and new behaviors to the data abstraction, without recompiling existing code, and while retaining static type safety (e.g., no casts). The statement of the problem exposes deficiencies in [[programming paradigm]]s and [[programming language]]s,. andPhilip {{as of|2023|lc=y}} is still considered unsolvedWadler,{{citation needed|date=Octoberone 2023}}of althoughthe there are many proposed solutions.{{citation needed|reason=feels misleading as if there is some buzzco-authors of research interest or activityHaskell, whereashas in fact most oforiginated the references are from 30 years ago|date=October 2023}}term.

== History ==