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<p>first example of an <a href="page.php?w=object-oriented_programming">object-oriented programming</a> language; Simula also introduced the concept of <a href="page.php?w=coroutine">coroutine</a>s.<br/>
* In 1964, <a href="page.php?w=Peter_Landin">Peter Landin</a> is the first to realize Church's lambda calculus can be used to model programming languages. He introduces the <a href="page.php?w=SECD_machine">SECD machine</a> which "interprets" lambda expressions.<br/>
* In 1965, Landin introduces the <a href="page.php?w=J_operator">J operator</a>,</p><p>
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