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
- 12% duplication:
- 96,320 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 11,666 duplicated lines
- 891 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
litho-processor (2%)
--> litho-sections-processor (35%)
722
15 file pairs
details...
litho-widget-material (40%)
--> litho-widget (1%)
387
6 file pairs
details...
litho-processor (1%)
--> litho-testing (3%)
332
3 file pairs
details...
litho-rendercore-text (16%)
--> litho-widget (1%)
322
5 file pairs
details...
litho-core (<1%)
--> litho-rendercore (3%)
264
8 file pairs
details...
litho-core (<1%)
--> litho-rendercore-yoga (16%)
136
1 file pair
details...
litho-it (1%)
--> litho-widget (<1%)
104
38 file pairs
details...
litho-core (<1%)
--> litho-testing (<1%)
103
5 file pairs
details...
litho-core (<1%)
--> litho-rendercore-transitions (<1%)
62
9 file pairs
details...
litho-core (<1%)
--> litho-rendercore-text (2%)
58
1 file pair
details...
litho-core (<1%)
--> litho-sections-core (<1%)
54
3 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| litho-processor (2%) --> litho-sections-processor (35%) |
722 | 15 file pairs | details... |
| litho-widget-material (40%) --> litho-widget (1%) |
387 | 6 file pairs | details... |
| litho-processor (1%) --> litho-testing (3%) |
332 | 3 file pairs | details... |
| litho-rendercore-text (16%) --> litho-widget (1%) |
322 | 5 file pairs | details... |
| litho-core (<1%) --> litho-rendercore (3%) |
264 | 8 file pairs | details... |
| litho-core (<1%) --> litho-rendercore-yoga (16%) |
136 | 1 file pair | details... |
| litho-it (1%) --> litho-widget (<1%) |
104 | 38 file pairs | details... |
| litho-core (<1%) --> litho-testing (<1%) |
103 | 5 file pairs | details... |
| litho-core (<1%) --> litho-rendercore-transitions (<1%) |
62 | 9 file pairs | details... |
| litho-core (<1%) --> litho-rendercore-text (2%) |
58 | 1 file pair | details... |
| litho-core (<1%) --> litho-sections-core (<1%) |
54 | 3 file pairs | details... |
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 173 | x 2 | codelabs/hello-world/app/src/main/res/drawablecodelabs/state/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/events/app/src/main/res/drawablecodelabs/props/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/events/app/src/main/res/drawablecodelabs/hscroll-height/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hello-world/app/src/main/res/drawablecodelabs/save-state-rota...p/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/props/app/src/main/res/drawablecodelabs/state/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hello-world/app/src/main/res/drawablecodelabs/updating-ui/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/events/app/src/main/res/drawablecodelabs/group-section-l...p/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/group-section-l...p/src/main/res/drawablecodelabs/updating-ui/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/state/app/src/main/res/drawablecodelabs/updating-ui/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/group-section-l...p/src/main/res/drawablecodelabs/props/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/save-state-rota...p/src/main/res/drawablecodelabs/state/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hscroll-height/app/src/main/res/drawablecodelabs/state/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hello-world/app/src/main/res/drawablecodelabs/props/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/group-section-l...p/src/main/res/drawablecodelabs/save-state-rota...p/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/save-state-rota...p/src/main/res/drawablecodelabs/updating-ui/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/group-section-l...p/src/main/res/drawablecodelabs/hello-world/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/group-section-l...p/src/main/res/drawablecodelabs/state/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/group-section-l...p/src/main/res/drawablecodelabs/hscroll-height/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/events/app/src/main/res/drawablecodelabs/save-state-rota...p/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/events/app/src/main/res/drawablecodelabs/hello-world/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/props/app/src/main/res/drawablecodelabs/updating-ui/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hscroll-height/app/src/main/res/drawablecodelabs/save-state-rota...p/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/events/app/src/main/res/drawablecodelabs/state/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/events/app/src/main/res/drawablecodelabs/updating-ui/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hello-world/app/src/main/res/drawablecodelabs/hscroll-height/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/props/app/src/main/res/drawablecodelabs/save-state-rota...p/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hscroll-height/app/src/main/res/drawablecodelabs/props/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 173 | x 2 | codelabs/hscroll-height/app/src/main/res/drawablecodelabs/updating-ui/app/src/main/res/drawable | 1:189 (100%)1:189 (100%) | view | |
| 145 | x 2 | litho-sections-processor...ctions/specmodels/modellitho-sections-processor...ctions/specmodels/model | 116:354 (67%)116:354 (67%) | view | |
| 120 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-processor/src/main.../litho/specmodels/model | 93:290 (54%)106:306 (47%) | view | |
| 97 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-sections-processor...ctions/specmodels/model | 93:251 (44%)116:274 (45%) | view | |
| 97 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-sections-processor...ctions/specmodels/model | 93:251 (44%)116:274 (45%) | view | |
| 97 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-sections-processor...ctions/specmodels/model | 106:267 (38%)116:274 (45%) | view | |
| 97 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-sections-processor...ctions/specmodels/model | 106:267 (38%)116:274 (45%) | view | |
| 77 | x 2 | litho-core-kotlin/src/ma...tlin/com/facebook/litholitho-core-kotlin/src/ma...tlin/com/facebook/litho | 167:264 (40%)169:266 (41%) | view | |
| 61 | x 2 | codelabs/layout-spec/app.../facebook/litho/codelabcodelabs/mount-spec/app/.../facebook/litho/codelab | 17:112 (100%)17:112 (100%) | view | |
| 61 | x 2 | litho-rendercore-text/sr...acebook/rendercore/textlitho-widget/src/main/ja...m/facebook/litho/widget | 222:288 (31%)297:363 (21%) | view | |
| 60 | x 2 | codelabs/layout-spec/app.../facebook/litho/codelabcodelabs/textinput-keybo...litho/codelab/textinput | 26:112 (98%)26:112 (98%) | view | |
| 60 | x 2 | codelabs/mount-spec/app/.../facebook/litho/codelabcodelabs/textinput-keybo...litho/codelab/textinput | 26:112 (98%)26:112 (98%) | view | |
| 54 | x 2 | litho-testing/src/main/j.../facebook/litho/testinglitho-testing/src/main/j.../facebook/litho/testing | 291:427 (23%)219:355 (32%) | view | |
| 52 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-testing/src/main/j...itho/testing/specmodels | 236:320 (5%)228:311 (8%) | view | |
| 52 | x 2 | litho-processor/src/main...pecmodels/model/testinglitho-sections-processor...ctions/specmodels/model | 103:186 (26%)116:199 (24%) | view | |
| 52 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-processor/src/main...pecmodels/model/testing | 106:192 (20%)103:186 (26%) | view | |
| 52 | x 2 | litho-processor/src/main...pecmodels/model/testinglitho-sections-processor...ctions/specmodels/model | 103:186 (26%)116:199 (24%) | view | |
| 52 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-processor/src/main...pecmodels/model/testing | 93:176 (23%)103:186 (26%) | view | |
| 46 | x 2 | codelabs/hscroll-height/...c/main/res/drawable-v24codelabs/updating-ui/app/src/main/res/drawable-v24 | 17:65 (100%)17:65 (100%) | view | |
| 46 | x 2 | codelabs/events/app/src/main/res/drawable-v24codelabs/state/app/src/main/res/drawable-v24 | 17:65 (100%)17:65 (100%) | view | |
| 46 | x 2 | codelabs/group-section-l...c/main/res/drawable-v24codelabs/hscroll-height/...c/main/res/drawable-v24 | 17:65 (100%)17:65 (100%) | view | |
| 46 | x 2 | codelabs/group-section-l...c/main/res/drawable-v24codelabs/save-state-rota...c/main/res/drawable-v24 | 17:65 (100%)17:65 (100%) | view | |
| 46 | x 2 | codelabs/events/app/src/main/res/drawable-v24codelabs/hello-world/app/src/main/res/drawable-v24 | 17:65 (100%)17:65 (100%) | view |
Duplicated Units
The list of top 28 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 26 | x 2 | litho-rendercore-text/sr...acebook/rendercore/textlitho-widget/src/main/ja...m/facebook/litho/widget | 222:249 297:324 | view | |
| 24 | x 2 | litho-testing/src/main/j.../facebook/litho/testinglitho-core/src/main/java/com/facebook/litho | 46:73 463:490 | view | |
| 22 | x 2 | litho-rendercore-text/sr...acebook/rendercore/textlitho-widget/src/main/ja...m/facebook/litho/widget | 251:274 326:349 | view | |
| 22 | x 2 | litho-core/src/main/java/com/facebook/litholitho-rendercore-yoga/sr...com/facebook/rendercore | 51:98 50:97 | view | |
| 21 | x 3 | codelabs/layout-spec/app.../facebook/litho/codelabcodelabs/textinput-keybo...litho/codelab/textinputcodelabs/mount-spec/app/.../facebook/litho/codelab | 80:105 80:105 80:105 | view | |
| 17 | x 2 | litho-it/src/main/java/com/facebook/litho/widgetlitho-it/src/main/java/com/facebook/litho/widget | 75:96 77:98 | view | |
| 15 | x 2 | litho-it/src/main/java/com/facebook/litho/widgetlitho-it/src/main/java/com/facebook/litho/widget | 39:56 37:54 | view | |
| 14 | x 2 | litho-core/src/main/java/com/facebook/litholitho-rendercore-yoga/sr...com/facebook/rendercore | 154:173 153:172 | view | |
| 13 | x 2 | litho-testing/src/main/j.../facebook/litho/testinglitho-testing/src/main/j.../facebook/litho/testing | 147:161 110:124 | view | |
| 12 | x 2 | litho-core/src/main/java/com/facebook/litholitho-sections-core/src/...facebook/litho/sections | 2776:2789 131:144 | view | |
| 11 | x 2 | litho-rendercore/src/mai...cebook/rendercore/utilslitho-core/src/main/java/com/facebook/litho | 119:138 104:123 | view | |
| 10 | x 2 | litho-processor/src/main.../litho/specmodels/modellitho-testing/src/main/j...itho/testing/specmodels | 35:46 39:50 | view | |
| 9 | x 3 | codelabs/layout-spec/app.../facebook/litho/codelabcodelabs/textinput-keybo...litho/codelab/textinputcodelabs/mount-spec/app/.../facebook/litho/codelab | 34:44 34:44 34:44 | view | |
| 9 | x 2 | litho-it/src/main/java/com/facebook/litho/widgetlitho-it/src/main/java/com/facebook/litho/widget | 38:48 46:56 | view | |
| 8 | x 2 | litho-rendercore/src/mai...com/facebook/rendercorelitho-core/src/main/java/com/facebook/litho | 235:246 52:63 | view | |
| 8 | x 2 | litho-widget/src/main/ja...m/facebook/litho/widgetlitho-widget/src/main/ja...m/facebook/litho/widget | 134:146 173:185 | view | |
| 8 | x 2 | litho-it/src/main/java/com/facebook/litho/widgetlitho-it/src/main/java/com/facebook/litho/widget | 99:108 101:110 | view | |
| 8 | x 2 | litho-sections-processor...ns/specmodels/processorlitho-sections-processor...ns/specmodels/processor | 124:133 121:130 | view | |
| 7 | x 2 | litho-processor/src/main...ho/specmodels/generatorlitho-processor/src/main...odels/generator/testing | 302:310 340:348 | view | |
| 7 | x 2 | litho-rendercore/src/mai...com/facebook/rendercorelitho-core/src/main/java/com/facebook/litho | 427:436 926:935 | view | |
| 7 | x 2 | litho-testing/src/main/j.../facebook/litho/testinglitho-core/src/main/java/com/facebook/litho | 26:34 453:461 | view | |
| 7 | x 2 | litho-core/src/main/java/com/facebook/litholitho-core/src/main/java/com/facebook/litho | 2655:2664 131:140 | view | |
| 7 | x 2 | litho-core/src/main/java/com/facebook/litholitho-rendercore-transit...java/com/facebook/litho | 28:38 684:694 | view | |
| 7 | x 3 | codelabs/layout-spec/app.../facebook/litho/codelabcodelabs/textinput-keybo...litho/codelab/textinputcodelabs/mount-spec/app/.../facebook/litho/codelab | 54:62 54:62 54:62 | view | |
| 7 | x 2 | litho-widget/src/main/ja...m/facebook/litho/widgetlitho-widget/src/main/ja...m/facebook/litho/widget | 123:132 217:227 | view | |
| 6 | x 2 | litho-rendercore-text/sr...acebook/rendercore/textlitho-widget/src/main/ja...m/facebook/litho/widget | 399:406 847:854 | view | |
| 6 | x 2 | litho-it/src/main/java/com/facebook/litho/widgetlitho-it/src/main/java/com/facebook/litho/widget | 56:63 41:48 | view | |
| 6 | x 2 | litho-sections-processor...ctions/specmodels/modellitho-sections-processor...ctions/specmodels/model | 374:381 374:381 | view |