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
- 16% duplication:
- 5,191 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 858 duplicated lines
- 106 duplicates
Duplication per Extension
Duplication per Component (primary)
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 35 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 201:277 (26%)61:135 (59%) | view | |
| 32 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 26:118 (71%)26:111 (71%) | view | |
| 32 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 26:119 (71%)26:111 (71%) | view | |
| 32 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 26:118 (71%)26:119 (71%) | view | |
| 22 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 348:369 (7%)384:405 (7%) | view | |
| 20 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 292:311 (7%)386:405 (7%) | view | |
| 20 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 292:311 (7%)350:369 (7%) | view | |
| 17 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 99:148 (28%)68:119 (37%) | view | |
| 17 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 99:148 (28%)68:118 (37%) | view | |
| 17 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 99:148 (28%)64:111 (37%) | view | |
| 15 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 36:73 (25%)31:68 (33%) | view | |
| 15 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 36:73 (25%)31:68 (33%) | view | |
| 15 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 77:136 (15%)105:166 (10%) | view | |
| 15 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 36:73 (25%)31:64 (33%) | view | |
| 14 | x 2 | src/Facebook/InstantArticles/Transformer/Rulessrc/Facebook/InstantArticles/Transformer/Rules | 53:76 (26%)52:75 (32%) | view | |
| 14 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 239:277 (10%)68:105 (31%) | view | |
| 14 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 239:277 (10%)64:100 (31%) | view | |
| 14 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 239:277 (10%)68:106 (31%) | view | |
| 13 | x 2 | src/Facebook/InstantArticles/Transformer/Rulessrc/Facebook/InstantArticles/Transformer/Rules | 33:48 (24%)32:47 (30%) | view | |
| 12 | x 2 | src/Facebook/InstantArticles/Transformer/Rulessrc/Facebook/InstantArticles/Transformer/Rules | 76:89 (11%)65:78 (14%) | view | |
| 12 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 141:181 (12%)171:219 (8%) | view | |
| 11 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 201:213 (8%)56:68 (24%) | view | |
| 11 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 167:200 (18%)121:154 (26%) | view | |
| 11 | x 2 | src/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getters | 18:43 (42%)18:43 (47%) | view | |
| 11 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 201:213 (8%)56:68 (24%) | view | |
| 11 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 201:213 (8%)52:64 (24%) | view | |
| 10 | x 2 | src/Facebook/InstantArticles/Transformer/Rulessrc/Facebook/InstantArticles/Transformer/Rules | 47:58 (14%)35:46 (19%) | view | |
| 10 | x 2 | src/Facebook/InstantArticles/Transformer/Rulessrc/Facebook/InstantArticles/Transformer/Rules | 78:89 (18%)64:75 (23%) | view | |
| 10 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 184:209 (16%)219:245 (12%) | view | |
| 10 | x 2 | src/Facebook/InstantArticles/Transformer/Rulessrc/Facebook/InstantArticles/Transformer/Rules | 32:42 (23%)35:45 (20%) | view | |
| 10 | x 2 | src/Facebook/InstantArticles/Transformer/Logssrc/Facebook/InstantArticles/Transformer/Logs | 64:73 (19%)86:95 (19%) | view | |
| 10 | x 2 | src/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getters | 15:30 (58%)15:30 (52%) | view | |
| 10 | x 2 | src/Facebook/InstantArticles/Transformer/Warningssrc/Facebook/InstantArticles/Transformer/Warnings | 19:53 (62%)19:52 (43%) | view | |
| 9 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 66:103 (9%)47:82 (19%) | view | |
| 9 | x 2 | src/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getters | 15:29 (56%)15:29 (47%) | view | |
| 9 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 314:344 (9%)511:541 (6%) | view | |
| 9 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 71:101 (15%)92:122 (11%) | view | |
| 9 | x 2 | src/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getters | 15:29 (56%)15:29 (52%) | view | |
| 9 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 334:352 (9%)186:204 (19%) | view | |
| 8 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 195:221 (8%)97:122 (17%) | view | |
| 8 | x 2 | src/Facebook/InstantArticles/Clientsrc/Facebook/InstantArticles/Client | 37:44 (15%)65:72 (15%) | view | |
| 8 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 265:291 (8%)128:154 (17%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 57:83 (13%)29:55 (20%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 54:82 (14%)105:132 (4%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 56:77 (9%)105:132 (4%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 54:82 (14%)59:87 (9%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 77:103 (7%)59:87 (9%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 56:77 (9%)54:82 (14%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 198:221 (7%)134:157 (9%) | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 99:122 (14%)134:157 (9%) | view |
Duplicated Units
The list of top 7 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 13 | x 2 | src/Facebook/InstantArticles/Transformer/Rulessrc/Facebook/InstantArticles/Transformer/Rules | 32:48 33:49 | view | |
| 12 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 186:205 334:353 | view | |
| 11 | x 5 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 61:74 52:65 56:69 56:69 201:214 | view | |
| 11 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 87:100 227:240 | view | |
| 11 | x 5 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 123:136 88:101 94:107 93:106 265:278 | view | |
| 7 | x 5 | src/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getterssrc/Facebook/InstantArticles/Transformer/Getters | 15:23 20:28 15:23 20:28 15:23 | view | |
| 7 | x 2 | src/Facebook/InstantArticles/Elementssrc/Facebook/InstantArticles/Elements | 182:190 136:144 | view |