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
- 17% duplication:
- 8,355 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 1,473 duplicated lines
- 147 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
shells/browser/chrome (43%)
--> shells/browser/shared (4%)
60
8 file pairs
details...
shells/browser/chrome (38%)
--> shells/browser/firefox (47%)
53
12 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| shells/browser/chrome (43%) --> shells/browser/shared (4%) |
60 | 8 file pairs | details... |
| shells/browser/chrome (38%) --> shells/browser/firefox (47%) |
53 | 12 file pairs | details... |
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 48 | x 2 | src/devtools/views/Networksrc/devtools/views/StoreInspector/EventLogger | 21:73 (21%)18:70 (30%) | view | |
| 41 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 10:57 (100%)10:57 (100%) | view | |
| 37 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views | 15:57 (88%)14:56 (48%) | view | |
| 30 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 10:44 (100%)10:44 (100%) | view | |
| 25 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 33:62 (37%)96:125 (10%) | view | |
| 24 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 10:37 (58%)98:125 (9%) | view | |
| 24 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 35:62 (35%)10:37 (58%) | view | |
| 23 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 142:164 (11%)208:230 (11%) | view | |
| 22 | x 2 | src/devtools/views/Componentssrc/devtools/views/Components | 86:107 (16%)134:155 (16%) | view | |
| 21 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 46:70 (10%)23:47 (15%) | view | |
| 21 | x 2 | src/devtoolssrc/devtools | 159:184 (6%)197:222 (6%) | view | |
| 19 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 134:152 (14%)144:162 (9%) | view | |
| 19 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 10:32 (15%)98:120 (7%) | view | |
| 19 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 134:152 (14%)210:228 (9%) | view | |
| 19 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 10:32 (15%)10:32 (46%) | view | |
| 19 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 10:32 (15%)35:57 (28%) | view | |
| 19 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 81:101 (15%)241:261 (7%) | view | |
| 19 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 86:104 (14%)210:228 (9%) | view | |
| 19 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 86:104 (14%)144:162 (9%) | view | |
| 19 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 62:83 (28%)69:90 (7%) | view | |
| 18 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 37:55 (41%)41:59 (36%) | view | |
| 18 | x 2 | src/devtools/views/Networksrc/devtools/views/StoreInspector | 11:29 (19%)11:29 (7%) | view | |
| 15 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector/EventLogger | 77:91 (7%)120:134 (7%) | view | |
| 15 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector/EventLogger | 119:133 (7%)223:237 (7%) | view | |
| 15 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 107:124 (12%)29:46 (6%) | view | |
| 14 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector/EventLogger | 77:90 (6%)224:237 (6%) | view | |
| 13 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 124:137 (10%)228:241 (5%) | view | |
| 12 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 121:132 (5%)294:305 (4%) | view | |
| 12 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 225:236 (5%)294:305 (4%) | view | |
| 12 | x 2 | src/devtools/views/Networksrc/devtools/views/StoreInspector | 29:43 (13%)51:65 (4%) | view | |
| 12 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 18:29 (5%)27:38 (4%) | view | |
| 12 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 78:89 (5%)294:305 (4%) | view | |
| 11 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 144:156 (8%)19:31 (57%) | view | |
| 11 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 12:23 (16%)147:158 (4%) | view | |
| 10 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 37:48 (24%)162:173 (4%) | view | |
| 9 | x 2 | src/devtools/views/Networksrc/devtools/views/StoreInspector/EventLogger | 33:43 (9%)146:156 (7%) | view | |
| 9 | x 2 | src/devtools/views/Networksrc/devtools/views/StoreInspector | 33:43 (9%)21:31 (47%) | view | |
| 9 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 146:156 (7%)55:65 (3%) | view | |
| 9 | x 2 | src/devtools/views/StoreInspectorsrc/devtools/views/StoreInspector | 21:31 (47%)55:65 (3%) | view | |
| 9 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 100:108 (4%)248:256 (3%) | view | |
| 9 | x 2 | packages/relay-devtoolsshells/browser/shared | 10:18 (7%)8:16 (33%) | view | |
| 9 | x 2 | src/devtools/views/Componentssrc/devtools/views/StoreInspector | 106:114 (6%)164:172 (4%) | view | |
| 9 | x 2 | src/devtools/viewssrc/devtools/views | 67:75 (12%)82:90 (12%) | view | |
| 9 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector/EventLogger | 54:62 (4%)168:176 (4%) | view | |
| 9 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector/EventLogger | 100:108 (4%)168:176 (4%) | view | |
| 9 | x 2 | packages/relay-devtools-core/srcpackages/relay-devtools-core/src | 144:154 (8%)112:123 (5%) | view | |
| 9 | x 2 | src/devtools/views/Networksrc/devtools/views/StoreInspector | 61:70 (9%)87:96 (3%) | view | |
| 9 | x 2 | shells/browser/chromeshells/browser/shared | 12:20 (42%)30:38 (10%) | view | |
| 9 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 54:62 (4%)248:256 (3%) | view | |
| 9 | x 2 | src/devtools/views/StoreInspector/EventLoggersrc/devtools/views/StoreInspector | 168:176 (4%)248:256 (3%) | view |
