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
- 13% duplication:
- 68,306 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 9,317 duplicated lines
- 972 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
case_study/code_size (15%)
--> case_study/memory_leaks (28%)
181
16 file pairs
details...
packages/devtools_app (<1%)
--> packages/devtools_server (2%)
54
3 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| case_study/code_size (15%) --> case_study/memory_leaks (28%) |
181 | 16 file pairs | details... |
| packages/devtools_app (<1%) --> packages/devtools_server (2%) |
54 | 3 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 82 | x 2 | packages/devtools_app/lib/src/performance/legacypackages/devtools_app/lib/src/performance |  timeline_flame_chart.darttimeline_flame_chart.dart |
1071:1161 (8%)1128:1218 (7%) | view |
| 80 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | event_details.dartevent_details.dart |
229:323 (31%)233:327 (31%) | view |
| 79 | x 2 | case_study/code_size/opt...d/code_size_package/libcase_study/code_size/uno...d/code_size_package/lib | main.dartmain.dart |
7:99 (84%)4:96 (89%) | view |
| 59 | x 2 | packages/devtools_app/lib/src/performance/legacypackages/devtools_app/lib/src/performance | timeline_flame_chart.darttimeline_flame_chart.dart |
881:955 (5%)923:997 (5%) | view |
| 58 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | event_details.dartevent_details.dart |
140:207 (22%)144:211 (22%) | view |
| 50 | x 2 | packages/devtools_app/lib/src/performance/legacypackages/devtools_app/lib/src/performance | timeline_flame_chart.darttimeline_flame_chart.dart |
586:645 (5%)628:687 (4%) | view |
| 50 | x 2 | packages/devtools_app/li...ctor/layout_explorer/uipackages/devtools_app/li...ctor/layout_explorer/ui | free_space.dartfree_space.dart |
26:75 (33%)103:152 (33%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1106:1149 (1%)2039:2082 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1336:1379 (1%)2283:2326 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1567:1610 (1%)2806:2849 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1106:1149 (1%)1798:1841 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1336:1379 (1%)2039:2082 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
2039:2082 (1%)2283:2326 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
2283:2326 (1%)2555:2598 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1798:1841 (1%)2039:2082 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1567:1610 (1%)1798:1841 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1798:1841 (1%)2283:2326 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1567:1610 (1%)2039:2082 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
1106:1149 (1%)2283:2326 (1%) | view |
| 44 | x 2 | packages/devtools_app/li...rovider/instance_viewerpackages/devtools_app/li...rovider/instance_viewer | instance_details.freezed.dartinstance_details.freezed.dart |
2283:2326 (1%)2806:2849 (1%) | view |
Duplicated Units
The list of top 20 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 53 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | event_details.dartevent_details.dart |
145:204 149:208 | view |
| 50 | x 2 | case_study/code_size/opt...d/code_size_package/libcase_study/code_size/uno...d/code_size_package/lib | main.dartmain.dart |
47:97 44:94 | view |
| 31 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | timeline_flame_chart.darttimeline_flame_chart.dart |
945:982 903:940 | view |
| 30 | x 2 | packages/devtools_app/lib/src/performance/legacypackages/devtools_app/lib/src/performance | performance_controller.dartperformance_controller.dart |
307:361 571:625 | view |
| 28 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | event_details.dartevent_details.dart |
271:299 275:303 | view |
| 25 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | event_details.dartevent_details.dart |
30:59 34:63 | view |
| 19 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | timeline_flame_chart.darttimeline_flame_chart.dart |
1346:1366 1289:1309 | view |
| 18 | x 2 | packages/devtools_app/lib/src/performance/legacypackages/devtools_app/lib/src/performance | performance_model.dartperformance_model.dart |
836:862 969:995 | view |
| 16 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | timeline_flame_chart.darttimeline_flame_chart.dart |
339:359 319:339 | view |
| 15 | x 2 | packages/devtools_app/lib/src/performance/legacypackages/devtools_app/lib/src/performance | performance_model.dartperformance_model.dart |
626:641 736:751 | view |
| 13 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | timeline_flame_chart.darttimeline_flame_chart.dart |
198:211 184:197 | view |
| 13 | x 2 | packages/devtools_app/lib/src/performance/legacypackages/devtools_app/lib/src/performance | performance_controller.dartperformance_controller.dart |
410:423 751:764 | view |
| 12 | x 2 | case_study/code_size/opt...ed/code_size_images/libcase_study/code_size/uno...ed/code_size_images/lib | animals.dartanimals.dart |
21:33 21:33 | view |
| 12 | x 2 | packages/devtools_app/lib/src/sharedpackages/devtools_app/lib/src/performance/legacy | common_widgets.dartflutter_frames_chart.dart |
1556:1568 214:226 | view |
| 12 | x 2 | packages/devtools_app/li...tor/layout_explorer/boxpackages/devtools_app/li...or/layout_explorer/flex | box.dartflex.dart |
86:98 229:241 | view |
| 12 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | timeline_event_processor.darttimeline_event_processor.dart |
501:513 625:637 | view |
| 12 | x 2 | packages/devtools_app/lib/src/performancepackages/devtools_app/lib/src/performance/legacy | event_details.dartevent_details.dart |
228:240 232:244 | view |
| 11 | x 2 | packages/devtools_app/li.../config_specific/loggerpackages/devtools_app/li.../config_specific/logger | logger_default.dartlogger_io.dart |
7:18 7:18 | view |
| 11 | x 2 | packages/devtools_app/lib/src/memorypackages/devtools_app/lib/src/memory | memory_instance_tree_view.dartmemory_analyzer.dart |
41:59 534:549 | view |
| 10 | x 2 | packages/devtools_app/lib/src/app_sizepackages/devtools_app/lib/src/app_size | app_size_table.dartapp_size_table.dart |
45:55 172:182 | view |