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In the mid-1980s, new object-oriented languages like [[Objective-C]], [[C++]], and [[Eiffel language|Eiffel]] emerged. Objective-C was developed by [[Brad Cox]], who had used Smalltalk at [[ITT Inc.]]. [[Bjarne Stroustrup]] created [[C++]] based on his experience using Simula for his PhD thesis.<ref name="Bertrand Meyer 2009 329"/> [[Bertrand Meyer]] produced the first design of the [[Eiffel language]] in 1985, which focused on software quality using a [[design by contract]] approach.{{sfn|Meyer|1997}}
In the 1990s, object-oriented programming became the main way of programming, especially as more languages supported it. These included [[Visual FoxPro]] 3.0,<ref>1995 (June) [[Visual FoxPro]] 3.0, FoxPro evolves from a procedural language to an object-oriented language. Visual FoxPro 3.0 introduces a database container, seamless client/server capabilities, support for ActiveX technologies, and OLE Automation and null support. [http://www.foxprohistory.org/foxprotimeline.htm#summary_of_fox_releases Summary of Fox releases]</ref><ref>1995 Reviewers Guide to Visual FoxPro 3.0: [http://www.dfpug.de/loseblattsammlung/migration/whitepapers/vfp_rg.htm DFpug.de]</ref> [[C++]],<ref>{{Cite book|url=https://books.google.com/books?id=MHmqfSBTXsAC&pg=PA16|title=Object Oriented Programming with C++, 1E|isbn=978-81-259-2532-3|last1=Khurana|first1=Rohit|date=1 November 2009|publisher=Vikas Publishing House Pvt Limited }}</ref> and [[Delphi (programming language)|Delphi]]{{Citation needed|date=February 2010}}. OOP became even more popular with the rise of [[graphical user interface]]s, which used objects for buttons, menus and other elements. One well-known example is Apple's [[Cocoa (software)|Cocoa]] framework, used on [[Mac OS X]] and written in [[Objective-C]]. OOP toolkits also enhanced the popularity of [[event-driven programming]].{{cn|date=February 2025}}
At [[ETH Zürich]], [[Niklaus Wirth]] and his colleagues created new approaches to OOP. [[Modula-2]] (1978) and [[Oberon (programming language)|Oberon]] (1987), included a distinctive approach to object orientation, classes, and type checking across module boundaries. Inheritance is not obvious in Wirth's design since his nomenclature looks in the opposite direction: It is called type extension and the viewpoint is from the parent down to the inheritor.
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