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By Thomas Kuhne

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There is another interesting class of so-called delegation based or prototyping languages like S ELF which use a dynamic type of inheritance and renounce classes. However, classless languages are not in widespread use and one of my aims is to improve the practice in object-oriented design. 1 Worldview The object-oriented paradigm suggests to decompose systems in autonomous objects. Autonomous means an object 1. represents a complete entity. It is not just material or tools but both at once. 2. has a self-supporting state.

One may use a sum type for homogenous lists but in order to differentiate actions according to individual element types type cases become necessary. Dynamic binding assigns the responsibility to differentiate to the elements and, therefore, avoids the type cases. , distributing operations to their data. Hence, case statements — otherwise contained in functions scattered around the whole program – are concentrated at data abstractions. Dynamic binding “merely” hides the indirection used to access the distributed operations.

With explicit type declarations a programmer might over-specify types and thereby unintentionally narrow the use of a function. For instance, someone programming functions on integer lists may type map as map :: (Int → Int) → [Int] → [Int], thus, excluding many other possible applications of map. There is a different view on this matter that argues that type declarations are not just a service to compilers but constitute a part of the programs documentation and even constitutes an albeit weak specification contribution.

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