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In [[computer science]], a '''dynamic programming language''' is a kind of [[programming language]] in which many tests to ensure that each computational step is valid are deferred until the operation is actually performed (at [[runtime]]) rather than taking place when the program is first prepared for execution (at [[compile time]]). They allow programs to change their structure as they run: functions may be introduced or removed, new classes of objects may be created, new modules may appear.
==Wrong Languages==
You can't have it both ways: either a language tries to do extensive compile-time checking, or it defers such checks until runtime. Eiffel advertises itself with all the wonderful things it does at compile time. As a result, it can't be a "dynamic language". In fact, Eiffel is the prototypical static language.
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