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What does Legacy Code Mean?
Legacy code describes an application program source code type that is supported. Legacy code can refer to operating systems, hardware and formats. Generally, legacy code is converted to a software language and platform. But to retain user functionality, legacy code is occasionally carried into new surroundings.
There is a false perception that legacy code is older. Although some software developers consider legacy code as a written program, legacy code really describes a code base that is no further engineered but patched. Over time, an infinite number of modifications may be made to a code base based causing what was initially well-written code to evolve into a monster that was intricate.
A software developer will comprehend legacy code if a feature cannot be added without breaking a different logic. At this point, the programmers may begin lobbying for a new method.
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For example encouraging a serial port although many systems don’t have a serial port. It can be in the kind of supporting older file formats such as EBCDIC. 
It creates an unchecked warning, although in fact, the mission is valid. Because the fact is that the compiler can t promise its correctness, the caution is necessary. We’ve got no way of assessing the legacy code from getAssembly() to ensure that really the collection being returned is a set of Parts. The type is Collection, and also one could insert all sorts of objects into a set.
Coder software to create code from the Simulink model.
M file for the S-function made by the Legacy Code Tool based on specs, the information structure. This option is relevant only in the Event That You use Simulink
As a web developer, I firmly believe legacy code ought to be abandoned to new features on version changes that are important. If you have a massive project based on software that’s transferred a version more than two weeks ago, you ought to stop all surgeries and rewrite what to respect the new version — especially if the software you’re using is business critical. There’s no program in the world large enough to require over two weeks for a transition that is full, and when there is, it ought to be scrapped and composed from scratch — the internet is a lot simpler than all people let on.
Legacy code is source code which relates to some no-longer supported[citation] or fabricated program or computer technologies. The expression was initially used by Java Scientist George Olivetti to explain code preserved.  The word could also imply code supported feature or previously inserted for the purpose of maintaining an older to software–