Places in code with 6 or more lines that are exactly the same.
Intro
- For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
- Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
- You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 30% duplication:
- 5,068 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 1,545 duplicated lines
- 1,400 duplicates
Duplication per Extension
Duplication per Component (primary)
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 14 | x 2 | languageslanguages | 167:184 (8%)169:186 (8%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)176:190 (6%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)176:190 (6%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 171:185 (7%)174:188 (7%) | view | |
| 12 | x 2 | languageslanguages | 171:185 (7%)170:184 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)172:186 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 171:185 (7%)176:190 (6%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)174:188 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)176:190 (6%) | view | |
| 12 | x 2 | languageslanguages | 170:184 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)170:184 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)176:190 (6%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)170:184 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)172:186 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)170:184 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 171:185 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)172:186 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)172:186 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 170:184 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 171:185 (7%)174:188 (7%) | view | |
| 12 | x 2 | languageslanguages | 170:184 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 171:185 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 176:190 (6%)170:184 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 171:185 (7%)172:186 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)174:188 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)172:186 (7%) | view | |
| 12 | x 2 | languageslanguages | 174:188 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)174:188 (7%) | view | |
| 12 | x 2 | languageslanguages | 173:187 (7%)173:187 (7%) | view |