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
- 58% duplication:
- 43,595 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 25,606 duplicated lines
- 6,199 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
animations (102%)
--> web (8%)
3368
73 file pairs
details...
experimental (26%)
--> web (8%)
3268
57 file pairs
details...
place_tracker (106%)
--> web (6%)
2809
19 file pairs
details...
navigation_and_routing (110%)
--> web (5%)
2209
45 file pairs
details...
form_app (115%)
--> web (4%)
1698
40 file pairs
details...
experimental (13%)
--> jsonexample (51%)
1654
31 file pairs
details...
experimental (12%)
--> testing_app (116%)
1580
30 file pairs
details...
experimental (12%)
--> isolate_example (70%)
1497
34 file pairs
details...
isolate_example (40%)
--> jsonexample (27%)
868
15 file pairs
details...
jsonexample (25%)
--> testing_app (58%)
802
13 file pairs
details...
provider_shopper (106%)
--> web (1%)
788
19 file pairs
details...
isolate_example (32%)
--> testing_app (50%)
690
13 file pairs
details...
infinite_list (70%)
--> web (<1%)
380
11 file pairs
details...
testing_app (26%)
--> web (<1%)
362
15 file pairs
details...
jsonexample (11%)
--> web (<1%)
360
11 file pairs
details...
experimental (2%)
--> navigation_and_routing (13%)
264
7 file pairs
details...
experimental (2%)
--> form_app (17%)
263
8 file pairs
details...
veggieseasons (3%)
--> web (<1%)
251
28 file pairs
details...
experimental (2%)
--> infinite_list (45%)
246
5 file pairs
details...
experimental (1%)
--> place_tracker (8%)
230
4 file pairs
details...
platform_design (9%)
--> web (<1%)
217
23 file pairs
details...
form_app (13%)
--> navigation_and_routing (9%)
195
6 file pairs
details...
form_app (11%)
--> place_tracker (6%)
176
4 file pairs
details...
jsonexample (5%)
--> navigation_and_routing (8%)
170
3 file pairs
details...
infinite_list (29%)
--> jsonexample (5%)
160
2 file pairs
details...
infinite_list (28%)
--> place_tracker (5%)
156
2 file pairs
details...
jsonexample (4%)
--> place_tracker (5%)
156
2 file pairs
details...
navigation_and_routing (7%)
--> testing_app (11%)
156
3 file pairs
details...
form_app (10%)
--> jsonexample (4%)
154
2 file pairs
details...
infinite_list (28%)
--> navigation_and_routing (7%)
154
2 file pairs
details...
form_app (10%)
--> infinite_list (28%)
154
2 file pairs
details...
infinite_list (28%)
--> testing_app (11%)
152
3 file pairs
details...
navigation_and_routing (7%)
--> place_tracker (5%)
150
2 file pairs
details...
form_app (9%)
--> testing_app (10%)
140
2 file pairs
details...
place_tracker (5%)
--> testing_app (10%)
136
2 file pairs
details...
isolate_example (6%)
--> web (<1%)
134
12 file pairs
details...
null_safety (29%)
--> web (<1%)
125
20 file pairs
details...
animations (3%)
--> platform_design (5%)
122
9 file pairs
details...
provider_counter (52%)
--> web (<1%)
120
12 file pairs
details...
experimental (<1%)
--> veggieseasons (1%)
118
9 file pairs
details...
platform_channels (8%)
--> web (<1%)
108
9 file pairs
details...
animations (3%)
--> veggieseasons (1%)
106
10 file pairs
details...
add_to_app (1%)
--> web (<1%)
91
15 file pairs
details...
platform_design (3%)
--> veggieseasons (1%)
86
7 file pairs
details...
animations (2%)
--> experimental (<1%)
86
6 file pairs
details...
animations (2%)
--> form_app (5%)
85
9 file pairs
details...
animations (2%)
--> navigation_and_routing (4%)
84
7 file pairs
details...
experimental (<1%)
--> platform_design (3%)
75
5 file pairs
details...
navigation_and_routing (3%)
--> veggieseasons (1%)
74
6 file pairs
details...
flutter_maps_firestore (14%)
--> web (<1%)
74
7 file pairs
details...
experimental (<1%)
--> provider_shopper (9%)
72
6 file pairs
details...
animations (2%)
--> provider_shopper (9%)
72
4 file pairs
details...
add_to_app (1%)
--> experimental (<1%)
72
10 file pairs
details...
experimental (<1%)
--> null_safety (16%)
71
6 file pairs
details...
infinite_list (12%)
--> null_safety (16%)
69
6 file pairs
details...
navigation_and_routing (3%)
--> platform_design (3%)
68
5 file pairs
details...
jsonexample (1%)
--> provider_counter (27%)
62
3 file pairs
details...
animations (1%)
--> testing_app (4%)
62
5 file pairs
details...
animations (1%)
--> platform_channels (4%)
60
3 file pairs
details...
animations (1%)
--> provider_counter (26%)
60
4 file pairs
details...
experimental (<1%)
--> provider_counter (26%)
60
5 file pairs
details...
provider_counter (26%)
--> provider_shopper (8%)
60
4 file pairs
details...
add_to_app (1%)
--> isolate_example (2%)
59
7 file pairs
details...
isolate_example (2%)
--> provider_shopper (7%)
58
3 file pairs
details...
form_app (3%)
--> veggieseasons (<1%)
58
5 file pairs
details...
animations (1%)
--> isolate_example (2%)
56
3 file pairs
details...
infinite_list (10%)
--> provider_shopper (7%)
54
3 file pairs
details...
form_app (3%)
--> platform_design (2%)
54
5 file pairs
details...
flutter_maps_firestore (10%)
--> isolate_example (2%)
54
4 file pairs
details...
jsonexample (1%)
--> null_safety (12%)
51
4 file pairs
details...
animations (1%)
--> null_safety (11%)
50
4 file pairs
details...
isolate_example (2%)
--> veggieseasons (<1%)
50
4 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| animations (102%) --> web (8%) |
3368 | 73 file pairs | details... |
| experimental (26%) --> web (8%) |
3268 | 57 file pairs | details... |
| place_tracker (106%) --> web (6%) |
2809 | 19 file pairs | details... |
| navigation_and_routing (110%) --> web (5%) |
2209 | 45 file pairs | details... |
| form_app (115%) --> web (4%) |
1698 | 40 file pairs | details... |
| experimental (13%) --> jsonexample (51%) |
1654 | 31 file pairs | details... |
| experimental (12%) --> testing_app (116%) |
1580 | 30 file pairs | details... |
| experimental (12%) --> isolate_example (70%) |
1497 | 34 file pairs | details... |
| isolate_example (40%) --> jsonexample (27%) |
868 | 15 file pairs | details... |
| jsonexample (25%) --> testing_app (58%) |
802 | 13 file pairs | details... |
| provider_shopper (106%) --> web (1%) |
788 | 19 file pairs | details... |
| isolate_example (32%) --> testing_app (50%) |
690 | 13 file pairs | details... |
| infinite_list (70%) --> web (<1%) |
380 | 11 file pairs | details... |
| testing_app (26%) --> web (<1%) |
362 | 15 file pairs | details... |
| jsonexample (11%) --> web (<1%) |
360 | 11 file pairs | details... |
| experimental (2%) --> navigation_and_routing (13%) |
264 | 7 file pairs | details... |
| experimental (2%) --> form_app (17%) |
263 | 8 file pairs | details... |
| veggieseasons (3%) --> web (<1%) |
251 | 28 file pairs | details... |
| experimental (2%) --> infinite_list (45%) |
246 | 5 file pairs | details... |
| experimental (1%) --> place_tracker (8%) |
230 | 4 file pairs | details... |
| platform_design (9%) --> web (<1%) |
217 | 23 file pairs | details... |
| form_app (13%) --> navigation_and_routing (9%) |
195 | 6 file pairs | details... |
| form_app (11%) --> place_tracker (6%) |
176 | 4 file pairs | details... |
| jsonexample (5%) --> navigation_and_routing (8%) |
170 | 3 file pairs | details... |
| infinite_list (29%) --> jsonexample (5%) |
160 | 2 file pairs | details... |
| infinite_list (28%) --> place_tracker (5%) |
156 | 2 file pairs | details... |
| jsonexample (4%) --> place_tracker (5%) |
156 | 2 file pairs | details... |
| navigation_and_routing (7%) --> testing_app (11%) |
156 | 3 file pairs | details... |
| form_app (10%) --> jsonexample (4%) |
154 | 2 file pairs | details... |
| infinite_list (28%) --> navigation_and_routing (7%) |
154 | 2 file pairs | details... |
| form_app (10%) --> infinite_list (28%) |
154 | 2 file pairs | details... |
| infinite_list (28%) --> testing_app (11%) |
152 | 3 file pairs | details... |
| navigation_and_routing (7%) --> place_tracker (5%) |
150 | 2 file pairs | details... |
| form_app (9%) --> testing_app (10%) |
140 | 2 file pairs | details... |
| place_tracker (5%) --> testing_app (10%) |
136 | 2 file pairs | details... |
| isolate_example (6%) --> web (<1%) |
134 | 12 file pairs | details... |
| null_safety (29%) --> web (<1%) |
125 | 20 file pairs | details... |
| animations (3%) --> platform_design (5%) |
122 | 9 file pairs | details... |
| provider_counter (52%) --> web (<1%) |
120 | 12 file pairs | details... |
| experimental (<1%) --> veggieseasons (1%) |
118 | 9 file pairs | details... |
| platform_channels (8%) --> web (<1%) |
108 | 9 file pairs | details... |
| animations (3%) --> veggieseasons (1%) |
106 | 10 file pairs | details... |
| add_to_app (1%) --> web (<1%) |
91 | 15 file pairs | details... |
| platform_design (3%) --> veggieseasons (1%) |
86 | 7 file pairs | details... |
| animations (2%) --> experimental (<1%) |
86 | 6 file pairs | details... |
| animations (2%) --> form_app (5%) |
85 | 9 file pairs | details... |
| animations (2%) --> navigation_and_routing (4%) |
84 | 7 file pairs | details... |
| experimental (<1%) --> platform_design (3%) |
75 | 5 file pairs | details... |
| navigation_and_routing (3%) --> veggieseasons (1%) |
74 | 6 file pairs | details... |
| flutter_maps_firestore (14%) --> web (<1%) |
74 | 7 file pairs | details... |
| experimental (<1%) --> provider_shopper (9%) |
72 | 6 file pairs | details... |
| animations (2%) --> provider_shopper (9%) |
72 | 4 file pairs | details... |
| add_to_app (1%) --> experimental (<1%) |
72 | 10 file pairs | details... |
| experimental (<1%) --> null_safety (16%) |
71 | 6 file pairs | details... |
| infinite_list (12%) --> null_safety (16%) |
69 | 6 file pairs | details... |
| navigation_and_routing (3%) --> platform_design (3%) |
68 | 5 file pairs | details... |
| jsonexample (1%) --> provider_counter (27%) |
62 | 3 file pairs | details... |
| animations (1%) --> testing_app (4%) |
62 | 5 file pairs | details... |
| animations (1%) --> platform_channels (4%) |
60 | 3 file pairs | details... |
| animations (1%) --> provider_counter (26%) |
60 | 4 file pairs | details... |
| experimental (<1%) --> provider_counter (26%) |
60 | 5 file pairs | details... |
| provider_counter (26%) --> provider_shopper (8%) |
60 | 4 file pairs | details... |
| add_to_app (1%) --> isolate_example (2%) |
59 | 7 file pairs | details... |
| isolate_example (2%) --> provider_shopper (7%) |
58 | 3 file pairs | details... |
| form_app (3%) --> veggieseasons (<1%) |
58 | 5 file pairs | details... |
| animations (1%) --> isolate_example (2%) |
56 | 3 file pairs | details... |
| infinite_list (10%) --> provider_shopper (7%) |
54 | 3 file pairs | details... |
| form_app (3%) --> platform_design (2%) |
54 | 5 file pairs | details... |
| flutter_maps_firestore (10%) --> isolate_example (2%) |
54 | 4 file pairs | details... |
| jsonexample (1%) --> null_safety (12%) |
51 | 4 file pairs | details... |
| animations (1%) --> null_safety (11%) |
50 | 4 file pairs | details... |
| isolate_example (2%) --> veggieseasons (<1%) |
50 | 4 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 454 | x 2 | place_tracker/libweb/place_tracker/lib |  place_map.dartplace_map.dart |
5:598 (100%)5:598 (100%) | view |
| 290 | x 2 | place_tracker/libweb/place_tracker/lib | place_details.dartplace_details.dart |
5:333 (100%)5:333 (100%) | view |
| 181 | x 2 | place_tracker/libweb/place_tracker/lib | place_list.dartplace_list.dart |
5:214 (100%)5:214 (100%) | view |
| 159 | x 2 | animations/libweb/animations/lib | main.dartmain.dart |
5:184 (100%)5:184 (100%) | view |
| 147 | x 2 | animations/lib/src/miscweb/animations/lib/src/misc | card_swipe.dartcard_swipe.dart |
5:202 (100%)5:202 (100%) | view |
| 146 | x 2 | isolate_example/windows/runnerjsonexample/windows/runner |  win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/desktop_photo_search/windows/runnerexperimental/linting_tool/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | form_app/lib/srcweb/form_app/lib/src | form_widgets.dartform_widgets.dart |
5:155 (75%)5:155 (75%) | view |
| 146 | x 2 | experimental/federated_p.../example/windows/runnerjsonexample/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/desktop_photo_search/windows/runnerisolate_example/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/federated_p.../example/windows/runnerisolate_example/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/linting_tool/windows/runnertesting_app/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/desktop_photo_search/windows/runnertesting_app/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/desktop_photo_search/windows/runnerjsonexample/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/desktop_photo_search/windows/runnerexperimental/federated_p.../example/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/federated_p.../example/windows/runnertesting_app/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/linting_tool/windows/runnerisolate_example/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/federated_p.../example/windows/runnerexperimental/linting_tool/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | isolate_example/windows/runnertesting_app/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
| 146 | x 2 | experimental/linting_tool/windows/runnerjsonexample/windows/runner | win32_window.cppwin32_window.cpp |
7:243 (100%)7:243 (100%) | view |
Duplicated Units
The list of top 20 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 135 | x 2 | web/form_app/lib/srcform_app/lib/src | validation.dartvalidation.dart |
22:167 22:167 | view |
| 133 | x 2 | web/form_app/lib/srcform_app/lib/src | form_widgets.dartform_widgets.dart |
25:158 25:158 | view |
| 99 | x 2 | web/form_app/lib/srcform_app/lib/src | autofill.dartautofill.dart |
20:119 20:119 | view |
| 79 | x 2 | experimental/web_dashboard/lib/src/widgetsweb/web_dashboard/lib/src/widgets | edit_entry.dartedit_entry.dart |
75:154 75:154 | view |
| 73 | x 2 | animations/lib/src/miscweb/animations/lib/src/misc | curved_animation.dartcurved_animation.dart |
87:160 87:160 | view |
| 70 | x 2 | add_to_app/plugin/flutter_module_using_plugin/libadd_to_app/android_view/...module_using_plugin/lib | main.dartmain.dart |
114:187 115:188 | view |
| 64 | x 2 | web/form_app/lib/srcform_app/lib/src | sign_in_http.dartsign_in_http.dart |
45:111 45:111 | view |
| 63 | x 2 | navigation_and_routing/lib/src/screensweb/navigation_and_routing/lib/src/screens | navigator.dartnavigator.dart |
38:112 38:112 | view |
| 61 | x 2 | add_to_app/prebuilt_module/flutter_module/libadd_to_app/fullscreen/flutter_module/lib | main.dartmain.dart |
102:164 102:164 | view |
| 58 | x 2 | animations/lib/src/basicsweb/animations/lib/src/basics | 06_custom_tween.dart06_custom_tween.dart |
48:106 48:106 | view |
| 53 | x 2 | experimental/web_dashboard/lib/src/pagesweb/web_dashboard/lib/src/pages | entries.dartentries.dart |
111:165 111:165 | view |
| 53 | x 2 | web/place_tracker/libplace_tracker/lib | place_details.dartplace_details.dart |
251:304 251:304 | view |
| 52 | x 2 | experimental/web_dashboard/lib/src/widgetsweb/web_dashboard/lib/src/widgets | category_forms.dartcategory_forms.dart |
53:105 53:105 | view |
| 51 | x 2 | web/place_tracker/libplace_tracker/lib | place_list.dartplace_list.dart |
164:215 164:215 | view |
| 51 | x 2 | web/place_tracker/libplace_tracker/lib | place_map.dartplace_map.dart |
170:235 170:235 | view |
| 46 | x 2 | animations/lib/src/miscweb/animations/lib/src/misc | expand_card.dartexpand_card.dart |
44:93 44:93 | view |
| 46 | x 2 | web/place_tracker/libplace_tracker/lib | place_map.dartplace_map.dart |
509:555 509:555 | view |
| 45 | x 2 | navigation_and_routing/lib/src/screensweb/navigation_and_routing/lib/src/screens | book_details.dartbook_details.dart |
20:65 20:65 | view |
| 45 | x 2 | experimental/web_dashboard/lib/src/widgetsweb/web_dashboard/lib/src/widgets | category_chart.dartcategory_chart.dart |
27:74 27:74 | view |
| 44 | x 2 | web/place_tracker/libplace_tracker/lib | place_tracker_app.dartplace_tracker_app.dart |
34:78 34:78 | view |