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
- 76% duplication:
- 100,268 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 76,343 duplicated lines
- 33,018 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
fixtures/guppy (30%)
--> fixtures/large (11%)
12434
589 file pairs
details...
fixtures/large (2%)
--> fixtures/small (22%)
3155
431 file pairs
details...
fixtures/guppy (2%)
--> fixtures/small (8%)
1228
247 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| fixtures/guppy (30%) --> fixtures/large (11%) |
12434 | 589 file pairs | details... |
| fixtures/large (2%) --> fixtures/small (22%) |
3155 | 431 file pairs | details... |
| fixtures/guppy (2%) --> fixtures/small (8%) |
1228 | 247 file pairs | details... |
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 813 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 173:1118 (76%)163:1108 (77%) | view | |
| 488 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 113:679 (50%)99:665 (51%) | view | |
| 311 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 752:1112 (32%)705:1065 (33%) | view | |
| 284 | x 2 | fixtures/large/summariesfixtures/large/summaries | 2285:2614 (12%)1982:2311 (13%) | view | |
| 225 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 363:623 (22%)316:576 (24%) | view | |
| 223 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1864:2122 (11%)1891:2149 (11%) | view | |
| 198 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 422:651 (18%)482:711 (17%) | view | |
| 198 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 482:711 (17%)412:641 (18%) | view | |
| 197 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 658:886 (19%)597:825 (21%) | view | |
| 194 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1967:2192 (7%)2563:2788 (6%) | view | |
| 188 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 756:974 (16%)672:890 (18%) | view | |
| 188 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 682:900 (17%)756:974 (16%) | view | |
| 179 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 798:1006 (18%)751:959 (19%) | view | |
| 179 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 798:1006 (18%)798:1006 (18%) | view | |
| 178 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 376:581 (35%)399:604 (34%) | view | |
| 168 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 910:1105 (16%)1109:1304 (14%) | view | |
| 164 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1938:2127 (8%)2236:2425 (7%) | view | |
| 164 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1459:1648 (8%)1468:1657 (7%) | view | |
| 160 | x 2 | fixtures/small/summariesfixtures/small/summaries | 21:205 (90%)19:203 (91%) | view | |
| 153 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1297:1474 (8%)1285:1462 (9%) | view | |
| 150 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1286:1459 (11%)1906:2079 (7%) | view | |
| 150 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1286:1459 (11%)1933:2106 (7%) | view | |
| 148 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 1163:1333 (12%)1044:1214 (14%) | view | |
| 148 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 123:294 (24%)129:300 (16%) | view | |
| 147 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 798:968 (15%)858:1028 (14%) | view | |
| 147 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 798:968 (15%)858:1028 (14%) | view | |
| 147 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 751:921 (16%)858:1028 (14%) | view | |
| 147 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 798:968 (15%)868:1038 (13%) | view | |
| 147 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 868:1038 (13%)751:921 (16%) | view | |
| 147 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 798:968 (15%)868:1038 (13%) | view | |
| 146 | x 2 | fixtures/small/summariesfixtures/small/summaries | 29:197 (86%)15:183 (93%) | view | |
| 146 | x 2 | fixtures/large/summariesfixtures/large/summaries | 837:1006 (7%)900:1069 (7%) | view | |
| 146 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 945:1114 (15%)987:1156 (14%) | view | |
| 142 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 98:262 (28%)88:252 (25%) | view | |
| 142 | x 2 | fixtures/large/summariesfixtures/large/summaries | 564:728 (10%)966:1130 (7%) | view | |
| 138 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1661:1820 (6%)974:1133 (9%) | view | |
| 137 | x 2 | fixtures/large/hakarifixtures/large/hakari | 125:261 (29%)140:276 (28%) | view | |
| 135 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 495:651 (13%)583:739 (11%) | view | |
| 134 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 408:562 (13%)401:555 (14%) | view | |
| 134 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 415:569 (13%)408:562 (13%) | view | |
| 134 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 401:555 (14%)361:515 (14%) | view | |
| 134 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 415:569 (13%)361:515 (14%) | view | |
| 133 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 350:503 (22%)315:468 (23%) | view | |
| 131 | x 2 | fixtures/guppy/hakarifixtures/guppy/hakari | 191:322 (35%)164:295 (39%) | view | |
| 130 | x 2 | fixtures/small/summariesfixtures/small/summaries | 16:166 (89%)33:183 (70%) | view | |
| 129 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 523:672 (12%)448:597 (14%) | view | |
| 129 | x 2 | fixtures/guppy/summariesfixtures/guppy/summaries | 448:597 (14%)513:662 (12%) | view | |
| 129 | x 2 | fixtures/large/summariesfixtures/large/summaries | 2072:2221 (5%)1783:1932 (6%) | view | |
| 124 | x 2 | fixtures/large/summariesfixtures/large/summaries | 1926:2068 (5%)1638:1780 (6%) | view | |
| 124 | x 2 | fixtures/large/summariesfixtures/large/summaries | 3535:3678 (3%)2154:2297 (6%) | view |
