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
- 3% duplication:
- 45,464 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 1,699 duplicated lines
- 155 duplicates
Duplication per Extension
Duplication per Component (primary)
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 19 | x 2 | proxygen/lib/http/codecproxygen/lib/http/codec | 75:93 (7%)180:204 (11%) | view | |
| 17 | x 2 | proxygen/lib/http/codecproxygen/lib/http/stats | 158:176 (10%)75:93 (18%) | view | |
| 16 | x 2 | proxygen/lib/http/codecproxygen/lib/http/codec | 375:392 (2%)401:421 (2%) | view | |
| 16 | x 2 | proxygen/lib/httpproxygen/lib/http | 101:116 (2%)141:156 (2%) | view | |
| 15 | x 2 | build/fbcode_builder/CMakebuild/fbcode_builder/CMake | 171:185 (8%)40:54 (15%) | view | |
| 14 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 722:735 (1%)1208:1221 (1%) | view | |
| 13 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 78:92 (7%)136:149 (7%) | view | |
| 13 | x 2 | proxygen/lib/http/codecproxygen/lib/http/codec | 38:56 (41%)39:56 (41%) | view | |
| 13 | x 2 | build/fbcode_builder/CMakebuild/fbcode_builder/CMake | 1:13 (52%)1:13 (38%) | view | |
| 13 | x 2 | proxygen/lib/http/codecproxygen/lib/http/codec | 96:108 (5%)207:225 (7%) | view | |
| 13 | x 2 | proxygen/lib/http/statsproxygen/lib/http/stats | 26:38 (56%)167:179 (8%) | view | |
| 13 | x 2 | proxygen/lib/http/codecproxygen/lib/http/stats | 199:215 (7%)103:119 (14%) | view | |
| 13 | x 2 | proxygen/lib/httpproxygen/lib/http | 185:197 (1%)227:239 (1%) | view | |
| 12 | x 2 | proxygen/lib/http/codecproxygen/lib/http/codec | 92:104 (15%)128:140 (15%) | view | |
| 12 | x 2 | proxygen/lib/http/codecproxygen/lib/http/stats | 39:53 (7%)37:51 (13%) | view | |
| 11 | x 2 | proxygen/lib/http/codecproxygen/lib/http/stats | 69:79 (4%)90:101 (12%) | view | |
| 11 | x 2 | build/fbcode_builder/CMakebuild/fbcode_builder/CMake | 115:127 (4%)180:192 (4%) | view | |
| 11 | x 2 | proxygen/lib/http/sessionproxygen/lib/http/session | 22:36 (57%)27:41 (37%) | view | |
| 11 | x 2 | build/fbcode_builder/CMakebuild/fbcode_builder/CMake | 86:97 (6%)53:64 (11%) | view | |
| 10 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 489:498 (1%)501:510 (1%) | view | |
| 10 | x 2 | build/fbcode_builder/CMakecmake | 2:12 (14%)8:18 (18%) | view | |
| 10 | x 2 | proxygen/lib/httpproxygen/lib/http | 641:655 (1%)686:700 (1%) | view | |
| 9 | x 2 | build/fbcode_builder/CMakebuild/fbcode_builder/CMake | 27:35 (5%)29:38 (12%) | view | |
| 9 | x 2 | proxygen/lib/http/codec/compressproxygen/lib/http/codec/compress | 71:82 (14%)113:124 (10%) | view | |
| 9 | x 2 | proxygen/lib/utilsproxygen/lib/utils | 54:63 (9%)20:28 (14%) | view | |
| 9 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 291:299 (1%)328:336 (1%) | view | |
| 9 | x 2 | proxygen/lib/utilsproxygen/lib/utils | 59:69 (15%)79:89 (15%) | view | |
| 9 | x 2 | proxygen/lib/http/codecproxygen/lib/http/stats | 78:93 (5%)57:71 (10%) | view | |
| 9 | x 2 | build/fbcode_builder/CMakebuild/fbcode_builder/CMake | 557:566 (1%)221:230 (3%) | view | |
| 9 | x 2 | proxygen/lib/http/sessionproxygen/lib/http/session | 36:44 (10%)67:75 (10%) | view | |
| 8 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 20:27 (2%)621:628 (1%) | view | |
| 8 | x 2 | proxygen/lib/http/statsproxygen/lib/http/stats | 45:52 (9%)65:72 (9%) | view | |
| 8 | x 2 | build/fbcode_builderbuild/fbcode_builder | 481:489 (<1%)502:510 (<1%) | view | |
| 8 | x 2 | proxygen/lib/http/connpoolproxygen/lib/http/connpool | 72:85 (3%)92:105 (3%) | view | |
| 8 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 289:297 (1%)310:318 (1%) | view | |
| 8 | x 2 | proxygen/lib/http/statsproxygen/lib/http/stats | 45:52 (9%)55:62 (9%) | view | |
| 8 | x 2 | proxygen/lib/http/sessionproxygen/lib/http/session | 344:351 (<1%)364:371 (<1%) | view | |
| 8 | x 2 | proxygen/lib/http/codecproxygen/lib/http/stats | 219:228 (4%)121:129 (8%) | view | |
| 8 | x 2 | proxygen/lib/http/statsproxygen/lib/http/stats | 35:42 (9%)55:62 (9%) | view | |
| 8 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 22:29 (<1%)256:263 (<1%) | view | |
| 8 | x 2 | proxygen/lib/http/statsproxygen/lib/http/stats | 35:42 (9%)45:52 (9%) | view | |
| 8 | x 2 | proxygen/lib/httpproxygen/lib/http | 154:162 (7%)85:93 (12%) | view | |
| 8 | x 2 | proxygen/lib/http/sessionproxygen/lib/http/session | 46:54 (7%)75:83 (5%) | view | |
| 8 | x 2 | proxygen/lib/utilsproxygen/lib/utils | 193:203 (3%)347:357 (3%) | view | |
| 8 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 165:172 (6%)176:183 (6%) | view | |
| 8 | x 2 | proxygen/lib/http/codec/compressproxygen/lib/http/codec/compress | 118:130 (6%)133:145 (6%) | view | |
| 8 | x 2 | proxygen/lib/http/statsproxygen/lib/http/stats | 35:42 (9%)65:72 (9%) | view | |
| 8 | x 2 | build/fbcode_builder/getdepsbuild/fbcode_builder/getdeps | 22:29 (<1%)521:528 (<1%) | view | |
| 8 | x 2 | proxygen/lib/http/sessionproxygen/lib/http/session | 2973:2982 (<1%)3623:3632 (<1%) | view | |
| 8 | x 2 | build/fbcode_builder/CMakebuild/fbcode_builder/CMake | 117:124 (4%)89:96 (8%) | view |
Duplicated Units
The list of top 1 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 9 | x 2 | proxygen/lib/http/codecproxygen/lib/http/codec | 193:203 681:691 | view |