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
- 54% duplication:
- 22,604 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 12,215 duplicated lines
- 1,129 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
aws/services/AutoScaling (102%)
--> aws/services/ElasticLoadBalancing (76%)
2912
12 file pairs
details...
aws/services/ElasticLoadBalancing (33%)
--> aws/services/VPC (77%)
1284
4 file pairs
details...
aws/solutions/CloudFormationEndpointSignals (61%)
--> aws/solutions/PrefixListResource (105%)
1197
4 file pairs
details...
aws/services/AutoScaling (36%)
--> aws/services/VPC (63%)
1047
3 file pairs
details...
aws/services/ECS (13%)
--> aws/solutions/LambaStaticIP (121%)
574
4 file pairs
details...
aws/solutions/ADConnector (30%)
--> aws/solutions/ManagedAD (75%)
410
1 file pair
details...
aws/solutions/ADConnector (15%)
--> aws/solutions/DirectoryServiceSettings (25%)
210
2 file pairs
details...
aws/solutions/OperatingSystems (9%)
--> aws/solutions (26%)
204
5 file pairs
details...
aws/services/ElasticLoadBalancing (4%)
--> aws/solutions (22%)
170
4 file pairs
details...
aws/solutions/StackSetsResource (10%)
--> community/custom_resources/python_custom_resource_helper (96%)
158
1 file pair
details...
aws/services/AutoScaling (4%)
--> aws/solutions (17%)
136
3 file pairs
details...
aws/solutions/ADConnector (9%)
--> aws/solutions/VPCPeering (7%)
134
2 file pairs
details...
aws/solutions/PrefixListResource (11%)
--> aws/solutions/StackSetsResource (8%)
126
2 file pairs
details...
aws/services/Cloud9 (65%)
--> aws/solutions/OperatingSystems (5%)
114
5 file pairs
details...
aws/solutions/VPCFlowLogs (10%)
--> aws/solutions/VPCPeering (6%)
109
13 file pairs
details...
aws/solutions/CloudFormationEndpointSignals (5%)
--> aws/solutions/PersistAZMapping (36%)
108
4 file pairs
details...
aws/solutions/DirectoryServiceSettings (12%)
--> aws/solutions/VPCPeering (5%)
102
2 file pairs
details...
aws/solutions/Fetch-AMI-From-Parameter-Store (87%)
--> aws/solutions/lambda-backed-cloudformation-custom-resources (4%)
82
2 file pairs
details...
aws/services/NeptuneDB (7%)
--> aws/services/ServiceCatalog (12%)
82
2 file pairs
details...
aws/services/ECS (1%)
--> aws/services/ElasticLoadBalancing (2%)
78
4 file pairs
details...
aws/services/AutoScaling (2%)
--> aws/services/ECS (1%)
78
4 file pairs
details...
aws/services/EC2 (17%)
--> aws/solutions/OperatingSystems (3%)
72
10 file pairs
details...
aws/services/VPC (4%)
--> aws/solutions (8%)
68
1 file pair
details...
aws/services/EC2 (15%)
--> aws/services/ElasticLoadBalancing (1%)
65
4 file pairs
details...
aws/solutions/PersistAZMapping (20%)
--> aws/solutions/PrefixListResource (5%)
60
1 file pair
details...
aws/services/AutoScaling (1%)
--> aws/services/EC2 (13%)
55
3 file pairs
details...
aws/services/ElasticLoadBalancing (1%)
--> aws/solutions/OperatingSystems (2%)
54
20 file pairs
details...
aws/services/Cloud9 (28%)
--> aws/solutions (6%)
50
1 file pair
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| aws/services/AutoScaling (102%) --> aws/services/ElasticLoadBalancing (76%) |
2912 | 12 file pairs | details... |
| aws/services/ElasticLoadBalancing (33%) --> aws/services/VPC (77%) |
1284 | 4 file pairs | details... |
| aws/solutions/CloudFormationEndpointSignals (61%) --> aws/solutions/PrefixListResource (105%) |
1197 | 4 file pairs | details... |
| aws/services/AutoScaling (36%) --> aws/services/VPC (63%) |
1047 | 3 file pairs | details... |
| aws/services/ECS (13%) --> aws/solutions/LambaStaticIP (121%) |
574 | 4 file pairs | details... |
| aws/solutions/ADConnector (30%) --> aws/solutions/ManagedAD (75%) |
410 | 1 file pair | details... |
| aws/solutions/ADConnector (15%) --> aws/solutions/DirectoryServiceSettings (25%) |
210 | 2 file pairs | details... |
| aws/solutions/OperatingSystems (9%) --> aws/solutions (26%) |
204 | 5 file pairs | details... |
| aws/services/ElasticLoadBalancing (4%) --> aws/solutions (22%) |
170 | 4 file pairs | details... |
| aws/solutions/StackSetsResource (10%) --> community/custom_resources/python_custom_resource_helper (96%) |
158 | 1 file pair | details... |
| aws/services/AutoScaling (4%) --> aws/solutions (17%) |
136 | 3 file pairs | details... |
| aws/solutions/ADConnector (9%) --> aws/solutions/VPCPeering (7%) |
134 | 2 file pairs | details... |
| aws/solutions/PrefixListResource (11%) --> aws/solutions/StackSetsResource (8%) |
126 | 2 file pairs | details... |
| aws/services/Cloud9 (65%) --> aws/solutions/OperatingSystems (5%) |
114 | 5 file pairs | details... |
| aws/solutions/VPCFlowLogs (10%) --> aws/solutions/VPCPeering (6%) |
109 | 13 file pairs | details... |
| aws/solutions/CloudFormationEndpointSignals (5%) --> aws/solutions/PersistAZMapping (36%) |
108 | 4 file pairs | details... |
| aws/solutions/DirectoryServiceSettings (12%) --> aws/solutions/VPCPeering (5%) |
102 | 2 file pairs | details... |
| aws/solutions/Fetch-AMI-From-Parameter-Store (87%) --> aws/solutions/lambda-backed-cloudformation-custom-resources (4%) |
82 | 2 file pairs | details... |
| aws/services/NeptuneDB (7%) --> aws/services/ServiceCatalog (12%) |
82 | 2 file pairs | details... |
| aws/services/ECS (1%) --> aws/services/ElasticLoadBalancing (2%) |
78 | 4 file pairs | details... |
| aws/services/AutoScaling (2%) --> aws/services/ECS (1%) |
78 | 4 file pairs | details... |
| aws/services/EC2 (17%) --> aws/solutions/OperatingSystems (3%) |
72 | 10 file pairs | details... |
| aws/services/VPC (4%) --> aws/solutions (8%) |
68 | 1 file pair | details... |
| aws/services/EC2 (15%) --> aws/services/ElasticLoadBalancing (1%) |
65 | 4 file pairs | details... |
| aws/solutions/PersistAZMapping (20%) --> aws/solutions/PrefixListResource (5%) |
60 | 1 file pair | details... |
| aws/services/AutoScaling (1%) --> aws/services/EC2 (13%) |
55 | 3 file pairs | details... |
| aws/services/ElasticLoadBalancing (1%) --> aws/solutions/OperatingSystems (2%) |
54 | 20 file pairs | details... |
| aws/services/Cloud9 (28%) --> aws/solutions (6%) |
50 | 1 file pair | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 328 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing |  AutoScalingScheduledAction.yamlELBWithLockedDownAutoScaledInstances.... |
10:337 (71%)12:339 (73%) | view |
| 324 | x 2 | aws/services/ElasticLoadBalancingaws/services/ElasticLoadBalancing | ELBGuidedAutoScalingRollingUpgrade.yamlELBWithLockedDownAutoScaledInstances.... |
12:335 (67%)12:335 (72%) | view |
| 324 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingScheduledAction.yamlELBGuidedAutoScalingRollingUpgrade.yaml |
10:333 (70%)12:335 (67%) | view |
| 323 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingScheduledAction.yamlELBStickinessSample.yaml |
9:331 (70%)12:334 (70%) | view |
| 322 | x 2 | aws/services/ElasticLoadBalancingaws/services/ElasticLoadBalancing | ELBStickinessSample.yamlELBWithLockedDownAutoScaledInstances.... |
13:334 (70%)12:333 (72%) | view |
| 322 | x 2 | aws/services/ElasticLoadBalancingaws/services/ElasticLoadBalancing | ELBGuidedAutoScalingRollingUpgrade.yamlELBStickinessSample.yaml |
12:333 (66%)13:334 (70%) | view |
| 321 | x 2 | aws/services/ElasticLoadBalancingaws/services/ElasticLoadBalancing | ELBGuidedAutoScalingRollingUpgrade.yamlELB_Access_Logs_And_Connection_Draini... |
12:332 (66%)9:329 (61%) | view |
| 321 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingScheduledAction.yamlELB_Access_Logs_And_Connection_Draini... |
10:330 (70%)9:329 (61%) | view |
| 321 | x 2 | aws/services/ElasticLoadBalancingaws/services/ElasticLoadBalancing | ELBWithLockedDownAutoScaledInstances....ELB_Access_Logs_And_Connection_Draini... |
12:332 (71%)9:329 (61%) | view |
| 321 | x 2 | aws/services/ElasticLoadBalancingaws/services/ElasticLoadBalancing | ELBStickinessSample.yamlELB_Access_Logs_And_Connection_Draini... |
13:333 (69%)9:329 (61%) | view |
| 299 | x 2 | aws/services/AutoScalingaws/services/AutoScaling | AutoScalingMultiAZWithNotifications.yamlAutoScalingScheduledAction.yaml |
40:338 (59%)33:331 (65%) | view |
| 299 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingMultiAZWithNotifications.yamlELBWithLockedDownAutoScaledInstances.... |
40:338 (59%)35:333 (67%) | view |
| 299 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingMultiAZWithNotifications.yamlELBStickinessSample.yaml |
40:338 (59%)36:334 (65%) | view |
| 299 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingMultiAZWithNotifications.yamlELBGuidedAutoScalingRollingUpgrade.yaml |
40:338 (59%)35:333 (61%) | view |
| 298 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingMultiAZWithNotifications.yamlELB_Access_Logs_And_Connection_Draini... |
40:337 (58%)32:329 (56%) | view |
| 227 | x 2 | aws/services/AutoScalingaws/services/VPC | AutoScalingRollingUpdates.yamlVPC_EC2_Instance_With_Multiple_Static... |
30:256 (50%)47:273 (57%) | view |
| 218 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingRollingUpdates.yamlELBStickinessSample.yaml |
39:256 (48%)67:284 (47%) | view |
| 218 | x 2 | aws/services/AutoScalingaws/services/VPC | AutoScalingMultiAZWithNotifications.yamlVPC_EC2_Instance_With_Multiple_Static... |
71:288 (43%)56:273 (55%) | view |
| 218 | x 2 | aws/services/ElasticLoadBalancingaws/services/VPC | ELB_Access_Logs_And_Connection_Draini...VPC_EC2_Instance_With_Multiple_Static... |
63:280 (41%)56:273 (55%) | view |
| 218 | x 2 | aws/services/AutoScalingaws/services/ElasticLoadBalancing | AutoScalingRollingUpdates.yamlELBWithLockedDownAutoScaledInstances.... |
39:256 (48%)66:283 (48%) | view |
Duplicated Units
The list of top 12 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 34 | x 2 | community/solutions/Stat...iteWithPipeline/lambdascommunity/solutions/Stat...iteWithPipeline/lambdas |  getHostedZoneName.jsclearBuckets.js |
26:69 67:110 | view |
| 30 | x 2 | aws/solutions/StackSetsResource/FunctionCodecommunity/custom_resourc..._custom_resource_helper |  crhelper.pycrhelper.py |
0:0 0:0 | view |
| 25 | x 3 | aws/solutions/lambda-bac.../update_endpoint_policyaws/solutions/lambda-bac...urces/update_kms_policyaws/solutions/lambda-bac...urces/get_latest_ami_id | lambda_function.pylambda_function.pylambda_function.py |
0:0 0:0 0:0 | view |
| 21 | x 2 | aws/solutions/Fetch-AMI-From-Parameter-Storeaws/solutions/lambda-bac...MI-From-Parameter-Store | lambda_function.pylambda_function.py |
0:0 0:0 | view |
| 21 | x 3 | aws/solutions/lambda-bac.../update_endpoint_policyaws/solutions/lambda-bac...urces/update_kms_policyaws/solutions/lambda-bac...urces/get_latest_ami_id | lambda_function.pylambda_function.pylambda_function.py |
0:0 0:0 0:0 | view |
| 20 | x 3 | aws/solutions/StackSetsResource/FunctionCodeaws/solutions/PrefixListResource/FunctionCodecommunity/custom_resourc..._custom_resource_helper | crhelper.pycrhelper.pycrhelper.py |
0:0 0:0 0:0 | view |
| 20 | x 3 | aws/solutions/PrefixListResource/FunctionCodeaws/solutions/StackSetsResource/FunctionCodecommunity/custom_resourc..._custom_resource_helper | crhelper.pycrhelper.pycrhelper.py |
0:0 0:0 0:0 | view |
| 17 | x 3 | aws/solutions/lambda-bac.../update_endpoint_policyaws/solutions/lambda-bac...urces/update_kms_policyaws/solutions/lambda-bac...urces/get_latest_ami_id | lambda_function.pylambda_function.pylambda_function.py |
0:0 0:0 0:0 | view |
| 10 | x 3 | aws/solutions/lambda-bac.../update_endpoint_policyaws/solutions/lambda-bac...urces/update_kms_policyaws/solutions/lambda-bac...urces/get_latest_ami_id | lambda_function.pylambda_function.pylambda_function.py |
0:0 0:0 0:0 | view |
| 10 | x 2 | aws/solutions/lambda-bac.../update_endpoint_policyaws/solutions/lambda-bac...urces/get_latest_ami_id | lambda_function.pylambda_function.py |
0:0 0:0 | view |
| 6 | x 2 | community/solutions/Stat...iteWithPipeline/lambdascommunity/solutions/Stat...iteWithPipeline/lambdas | requestCertificate.jsapproveCertificate.js |
3:11 3:11 | view |
| 7 | x 2 | aws/solutions/ADConnector/srcaws/solutions/DirectoryServiceSettings/src | adconnector_custom_resource.pydirectory_settings_custom_resource.py |
0:0 0:0 | view |