<Li> Chameleon languages that support multiple paradigms, including OO . Tcl stands out among these for TclOO, a hybrid object system that supports both prototype - based programming and class - based OO . </Li> <P> In recent years, object - oriented programming has become especially popular in dynamic programming languages . Python, PowerShell, Ruby and Groovy are dynamic languages built on OOP principles, while Perl and PHP have been adding object - oriented features since Perl 5 and PHP 4, and ColdFusion since version 6 . </P> <P> The Document Object Model of HTML, XHTML, and XML documents on the Internet has bindings to the popular JavaScript / ECMAScript language . JavaScript is perhaps the best known prototype - based programming language, which employs cloning from prototypes rather than inheriting from a class (contrast to class - based programming). Another scripting language that takes this approach is Lua . </P> <P> The messages that flow between computers to request services in a client - server environment can be designed as the linearizations of objects defined by class objects known to both the client and the server . For example, a simple linearized object would consist of a length field, a code point identifying the class, and a data value . A more complex example would be a command consisting of the length and code point of the command and values consisting of linearized objects representing the command's parameters . Each such command must be directed by the server to an object whose class (or superclass) recognizes the command and is able to provide the requested service . Clients and servers are best modeled as complex object - oriented structures . Distributed Data Management Architecture (DDM) took this approach and used class objects to define objects at four levels of a formal hierarchy: </P>

Is an object-oriented language that is sometimes used in web programming