Anobject-based language is aimperative programming language that provides a construct to encapsulate state and behavior as anobject. A language that also supportsinheritance orsubtyping is classified asobject-oriented.[1] Even though object-oriented programming is a superset of object-based programming, some authors distinguish them by name only when it is useful to point that a given programming language lacks inheritance.[citation needed] Examples of strictly object-based languages – supporting an object feature but not inheritance or subtyping – are early versions ofAda,[2]Visual Basic 6 (VB6), andFortran 90.
Some classifyprototype-based programming as object-based even though it supports inheritance and subtyping albeit not via aclass concept. Instead an object inherits its state and behavior from atemplate object. A commonly used language with prototype-based programming support isJavaScript.
Ada 83 itself is generally not considered to be object-oriented; rather, according to the terminology of Wegner [Weg 87], it is said to be object-based, since it provides only a restricted form of inheritance and it lacks polymorphism.
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