How Duplicates Are Created
There are a number of reasons why duplicate code may be created, including:
- Copy and paste programming, in which a section of code is copied "because it works". In most cases this operation involves slight modifications in the cloned code such as renaming variables or inserting/deleting code.
- Functionality that is very similar to that in another part of a program is required and a developer independently writes code that is very similar to what exists elsewhere.
- Plagiarism, where code is simply copied without permission or attribution.
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