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
- 55% duplication:
- 6,530 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 3,641 duplicated lines
- 1,406 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
nav2-usability/scenario_code/lib/deeplink-pathparam (57%)
--> nav2-usability/scenario_code/lib/skipping-stacks (28%)
792
49 file pairs
details...
nav2-usability/scenario_code/lib/dynamic-linking (26%)
--> nav2-usability/scenario_code/lib/skipping-stacks (17%)
482
49 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-pathparam (31%)
--> nav2-usability/scenario_code/lib/deeplink-queryparam (42%)
436
32 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-pathparam (28%)
--> nav2-usability/scenario_code/lib/dynamic-linking (21%)
393
49 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-queryparam (32%)
--> nav2-usability/scenario_code/lib/skipping-stacks (11%)
330
18 file pairs
details...
nav2-usability/scenario_code/lib/sign-in-routing (9%)
--> nav2-usability/scenario_code/lib/skipping-stacks (8%)
230
35 file pairs
details...
nav2-usability/scenario_code/lib/dynamic-linking (12%)
--> nav2-usability/scenario_code/lib/sign-in-routing (9%)
226
42 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-pathparam (14%)
--> nav2-usability/scenario_code/lib/sign-in-routing (8%)
206
49 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-queryparam (17%)
--> nav2-usability/scenario_code/lib/sign-in-routing (7%)
180
18 file pairs
details...
nav2-usability/scenario_code/lib/nested-routing (7%)
--> nav2-usability/scenario_code/lib/skipping-stacks (6%)
180
7 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-queryparam (17%)
--> nav2-usability/scenario_code/lib/nested-routing (7%)
180
7 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-queryparam (17%)
--> nav2-usability/scenario_code/lib/dynamic-linking (9%)
178
16 file pairs
details...
nav2-usability/scenario_code/lib/deeplink-pathparam (11%)
--> nav2-usability/scenario_code/lib/nested-routing (7%)
166
7 file pairs
details...
nav2-usability/scenario_code/lib/dynamic-linking (8%)
--> nav2-usability/scenario_code/lib/nested-routing (6%)
158
5 file pairs
details...
nav2-usability/scenario_code/lib/nested-routing (6%)
--> nav2-usability/scenario_code/lib/sign-in-routing (6%)
148
5 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| nav2-usability/scenario_code/lib/deeplink-pathparam (57%) --> nav2-usability/scenario_code/lib/skipping-stacks (28%) |
792 | 49 file pairs | details... |
| nav2-usability/scenario_code/lib/dynamic-linking (26%) --> nav2-usability/scenario_code/lib/skipping-stacks (17%) |
482 | 49 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-pathparam (31%) --> nav2-usability/scenario_code/lib/deeplink-queryparam (42%) |
436 | 32 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-pathparam (28%) --> nav2-usability/scenario_code/lib/dynamic-linking (21%) |
393 | 49 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-queryparam (32%) --> nav2-usability/scenario_code/lib/skipping-stacks (11%) |
330 | 18 file pairs | details... |
| nav2-usability/scenario_code/lib/sign-in-routing (9%) --> nav2-usability/scenario_code/lib/skipping-stacks (8%) |
230 | 35 file pairs | details... |
| nav2-usability/scenario_code/lib/dynamic-linking (12%) --> nav2-usability/scenario_code/lib/sign-in-routing (9%) |
226 | 42 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-pathparam (14%) --> nav2-usability/scenario_code/lib/sign-in-routing (8%) |
206 | 49 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-queryparam (17%) --> nav2-usability/scenario_code/lib/sign-in-routing (7%) |
180 | 18 file pairs | details... |
| nav2-usability/scenario_code/lib/nested-routing (7%) --> nav2-usability/scenario_code/lib/skipping-stacks (6%) |
180 | 7 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-queryparam (17%) --> nav2-usability/scenario_code/lib/nested-routing (7%) |
180 | 7 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-queryparam (17%) --> nav2-usability/scenario_code/lib/dynamic-linking (9%) |
178 | 16 file pairs | details... |
| nav2-usability/scenario_code/lib/deeplink-pathparam (11%) --> nav2-usability/scenario_code/lib/nested-routing (7%) |
166 | 7 file pairs | details... |
| nav2-usability/scenario_code/lib/dynamic-linking (8%) --> nav2-usability/scenario_code/lib/nested-routing (6%) |
158 | 5 file pairs | details... |
| nav2-usability/scenario_code/lib/nested-routing (6%) --> nav2-usability/scenario_code/lib/sign-in-routing (6%) |
148 | 5 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 95 | x 2 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacks |  router.dartskipping_stacks_beamer.dart |
393:504 (26%)145:256 (47%) | view |
| 61 | x 2 | nav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linking | dynamic_linking_beamer.dartdynamic_linking_navi.dart |
101:171 (44%)110:180 (44%) | view |
| 60 | x 2 | nav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linking | dynamic_linking_beamer.dartrouter.dart |
105:171 (43%)190:256 (33%) | view |
| 60 | x 2 | nav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linking | dynamic_linking_navi.dartrouter.dart |
114:180 (43%)190:256 (33%) | view |
| 58 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_beamer.dartrouter.dart |
135:206 (35%)234:305 (22%) | view |
| 53 | x 2 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | router.dartsign_in_routing_go_router.dart |
299:358 (20%)150:209 (29%) | view |
| 44 | x 2 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | sign_in_routing_beamer.dartsign_in_routing_go_router.dart |
150:197 (28%)162:209 (24%) | view |
| 44 | x 2 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | router.dartsign_in_routing_beamer.dart |
311:358 (17%)150:197 (28%) | view |
| 42 | x 2 | nav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparam | deeplink_pathparam_beamer.dartrouter.dart |
55:103 (48%)211:259 (23%) | view |
| 42 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_auto_route.dartnested_routing_qlevar_router.dart |
129:179 (30%)122:172 (32%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_beamer.dartnested_routing_qlevar_router.dart |
157:206 (25%)123:172 (31%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_auto_route.dartrouter.dart |
130:179 (29%)256:305 (16%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_beamer.dartnested_routing_go_router.dart |
157:206 (25%)150:199 (23%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_go_router.dartrouter.dart |
150:199 (23%)256:305 (16%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_go_router.dartnested_routing_qlevar_router.dart |
150:199 (23%)123:172 (31%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_auto_route.dartnested_routing_go_router.dart |
130:179 (29%)150:199 (23%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_qlevar_router.dartrouter.dart |
123:172 (31%)256:305 (16%) | view |
| 41 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_auto_route.dartnested_routing_beamer.dart |
130:179 (29%)157:206 (25%) | view |
| 40 | x 2 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | sign_in_routing_auto_route.dartsign_in_routing_go_router.dart |
153:203 (24%)136:186 (22%) | view |
| 39 | x 2 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | router.dartsign_in_routing_beamer.dart |
261:309 (15%)100:148 (24%) | view |
Duplicated Units
The list of top 19 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 30 | x 3 | nav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linking | router.dartdynamic_linking_navi.dartdynamic_linking_beamer.dart |
202:232 126:156 117:147 | view |
| 24 | x 3 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | router.dartsign_in_routing_auto_route.dartsign_in_routing_go_router.dart |
308:332 176:200 159:183 | view |
| 23 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | router.dartnested_routing_beamer.dart |
250:273 151:174 | view |
| 21 | x 3 | nav2-usability/scenario_...lib/deeplink-queryparamnav2-usability/scenario_...lib/deeplink-queryparamnav2-usability/scenario_...lib/deeplink-queryparam | deeplink_queryparam_navi.dartrouter.dartdeeplink-queryparam_beamer.dart |
102:123 141:162 73:94 | view |
| 20 | x 7 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | sign_in_routing_qlevar_router.dartsign_in_routing_navi.dartrouter.dartsign_in_routing_beamer.dartsign_in_routing_auto_route.dartsign_in_routing_vrouter.dartsign_in_routing_go_router.dart |
148:168 222:242 339:359 178:198 207:227 195:215 190:210 | view |
| 19 | x 2 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacks | router.dartskipping_stacks_beamer.dart |
462:481 214:233 | view |
| 18 | x 2 | nav2-usability/scenario_code/lib/sign-in-routingnav2-usability/scenario_code/lib/sign-in-routing | router.dartsign_in_routing_beamer.dart |
271:289 110:128 | view |
| 17 | x 2 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacks | router.dartskipping_stacks_beamer.dart |
432:449 184:201 | view |
| 14 | x 3 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacks | router.dartskipping_stacks_beamer.dartskipping_stacks_navi.dart |
403:417 155:169 228:242 | view |
| 14 | x 4 | nav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linking | router.dartdynamic_linking_go_router.dartdynamic_linking_navi.dartdynamic_linking_beamer.dart |
243:257 153:167 167:181 158:172 | view |
| 14 | x 6 | nav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparam | deeplink_pathparam_go_router.dartdeeplink_pathparam_beamer.dartrouter.dartdeeplink_pathparam_qlevar_router.dartdeeplink_pathparam_navi.dartdeeplink_pathparam_vrouter.dart |
101:115 90:104 246:260 61:75 143:157 89:103 | view |
| 14 | x 2 | nav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparam | deeplink_pathparam_beamer.dartrouter.dart |
65:79 221:235 | view |
| 13 | x 5 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacks | router.dartskipping_stacks_beamer.dartskipping_stacks_navi.dartskipping_stacks_vrouter.dartskipping_stacks_go_router.dart |
492:505 244:257 313:326 177:190 192:205 | view |
| 13 | x 2 | nav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linking | dynamic_linking_vrouter.dartdynamic_linking_auto_route.dart |
147:160 130:143 | view |
| 9 | x 2 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_.../lib/deeplink-pathparam | skipping_stacks_navi.dartdeeplink_pathparam_navi.dart |
173:183 65:75 | view |
| 7 | x 2 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | router.dartnested_routing_beamer.dart |
235:242 136:143 | view |
| 6 | x 4 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_...lib/deeplink-queryparamnav2-usability/scenario_code/lib/nested-routing | skipping_stacks_auto_route.dartdeeplink_pathparam_auto_route.dartdeeplink_queryparam_auto_route.dartnested_routing_auto_route.dart |
69:75 43:49 42:48 38:44 | view |
| 6 | x 12 | nav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/skipping-stacksnav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_code/lib/dynamic-linkingnav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_.../lib/deeplink-pathparamnav2-usability/scenario_...lib/deeplink-queryparamnav2-usability/scenario_...lib/deeplink-queryparamnav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing... | router.dartskipping_stacks_navi.dartrouter.dartdynamic_linking_navi.dartrouter.dartdeeplink_pathparam_navi.dartdeeplink_queryparam_navi.dartrouter.dartrouter.dartnested_routing_navi.dart... |
134:140 55:61 53:59 41:47 67:73 46:52 45:51 51:57 46:52 31:37 ... | view |
| 6 | x 8 | nav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routingnav2-usability/scenario_code/lib/nested-routing | nested_routing_auto_route.dartnested_routing_auto_route.dartrouter.dartnested_routing_beamer.dartnested_routing_vrouter.dartnested_routing_qlevar_router.dartnested_routing_go_router.dartnested_routing_navi.dart |
152:158 163:169 278:284 179:185 147:153 145:151 172:178 192:198 | view |