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
- 6% duplication:
- 20,323 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 1,366 duplicated lines
- 101 duplicates
Duplication per Extension
Duplication per Component (primary)
Longest Duplicates
The list of 50 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 24 | x 2 | packages/metro/srcpackages/metro/src | 708:732 (2%)825:849 (2%) | view | |
| 20 | x 2 | packages/metro/srcpackages/metro/src | 743:762 (1%)853:872 (1%) | view | |
| 20 | x 2 | packages/metro-symbolicate/srcpackages/metro-symbolicate/src | 453:481 (3%)610:639 (3%) | view | |
| 16 | x 2 | packages/metro/srcpackages/metro/src | 111:126 (6%)152:167 (6%) | view | |
| 16 | x 2 | packages/metro/srcpackages/metro/src | 775:793 (1%)883:901 (1%) | view | |
| 15 | x 2 | packages/metro/src/DeltaBundler/Serializerspackages/metro/src/DeltaBundler/Serializers | 54:69 (19%)56:71 (24%) | view | |
| 14 | x 2 | packages/metro-inspector-proxy/srcpackages/metro/src | 29:43 (51%)302:316 (3%) | view | |
| 13 | x 2 | packages/metro/srcpackages/metro/src | 694:706 (1%)811:823 (1%) | view | |
| 13 | x 2 | packages/metro/src/libpackages/metro/src/lib | 114:127 (11%)134:147 (11%) | view | |
| 13 | x 2 | packages/metro/src/DeltaBundlerpackages/metro/src/DeltaBundler | 73:85 (12%)107:119 (12%) | view | |
| 13 | x 2 | packages/metro/src/libpackages/metro/src/lib | 83:96 (11%)134:147 (11%) | view | |
| 13 | x 2 | packages/metro/src/libpackages/metro/src/lib | 57:70 (11%)134:147 (11%) | view | |
| 13 | x 2 | packages/metro/src/libpackages/metro/src/lib | 57:70 (11%)114:127 (11%) | view | |
| 13 | x 2 | packages/metro/src/libpackages/metro/src/lib | 57:70 (11%)83:96 (11%) | view | |
| 13 | x 2 | packages/metro/src/libpackages/metro/src/lib | 83:96 (11%)114:127 (11%) | view | |
| 13 | x 2 | packages/metro-memory-fs/srcpackages/metro-memory-fs/src | 851:864 (<1%)866:879 (<1%) | view | |
| 12 | x 2 | packages/metro/src/ModuleGraph/outputpackages/metro/src/ModuleGraph/output | 36:47 (10%)33:44 (15%) | view | |
| 12 | x 2 | packages/metro/srcpackages/metro/src | 203:214 (1%)280:291 (1%) | view | |
| 12 | x 2 | packages/metro/srcpackages/metro/src | 195:206 (1%)853:864 (1%) | view | |
| 12 | x 2 | packages/metro-transform-plugins/srcpackages/metro-transform-plugins/src | 301:313 (2%)317:329 (2%) | view | |
| 12 | x 2 | packages/metro/srcpackages/metro/src | 195:206 (1%)743:754 (1%) | view | |
| 11 | x 2 | packages/metro/src/Delta...ler/Serializers/helperspackages/metro/src/Delta...ler/Serializers/helpers | 18:29 (40%)18:29 (40%) | view | |
| 11 | x 2 | packages/metro-symbolicate/srcpackages/metro/src | 1:12 (91%)1:12 (84%) | view | |
| 11 | x 2 | packages/metro/src/shared/output/RamBundlepackages/metro/src/shared/output/RamBundle | 37:48 (14%)38:49 (6%) | view | |
| 11 | x 2 | packages/metro/src/shared/output/RamBundlepackages/metro/src/shared/output/RamBundle | 72:84 (14%)68:81 (6%) | view | |
| 10 | x 2 | packages/metro/src/ModuleGraph/node-hastepackages/metro/src/node-haste | 75:94 (15%)108:127 (11%) | view | |
| 10 | x 2 | packages/metro/src/DeltaBundlerpackages/metro/src/DeltaBundler | 84:94 (2%)151:161 (2%) | view | |
| 10 | x 2 | packages/metro/src/DeltaBundler/Serializerspackages/metro/src/DeltaBundler/Serializers | 32:45 (12%)30:43 (16%) | view | |
| 10 | x 2 | packages/metro/srcpackages/metro/src | 832:841 (<1%)940:949 (<1%) | view | |
| 10 | x 2 | packages/metro-transform-worker/srcpackages/metro-transform-worker/src | 487:497 (1%)606:616 (1%) | view | |
| 10 | x 2 | packages/metro/srcpackages/metro/src | 175:185 (<1%)252:262 (<1%) | view | |
| 10 | x 2 | packages/metro/srcpackages/metro/src | 715:724 (<1%)940:949 (<1%) | view | |
| 10 | x 2 | packages/metro-symbolicate/srcpackages/metro-symbolicate/src | 222:238 (2%)568:577 (2%) | view | |
| 9 | x 2 | packages/metro/src/shared/output/RamBundlepackages/metro/src/shared/output | 39:47 (5%)50:58 (15%) | view | |
| 9 | x 2 | packages/metro-transform-plugins/srcpackages/metro-transform-plugins/src | 290:299 (2%)326:335 (2%) | view | |
| 9 | x 2 | packages/metro-source-map/srcpackages/metro-source-map/src | 157:165 (4%)183:191 (4%) | view | |
| 9 | x 2 | packages/metro/srcpackages/metro/src | 528:536 (<1%)1128:1137 (<1%) | view | |
| 9 | x 2 | packages/metro-minify-terser/srcpackages/metro-minify-uglify/src | 36:44 (24%)35:43 (23%) | view | |
| 9 | x 2 | packages/metro/srcpackages/metro/src | 37:45 (4%)48:56 (4%) | view | |
| 9 | x 2 | packages/metro/src/shared/output/RamBundlepackages/metro/src/shared/output | 38:46 (11%)50:58 (15%) | view | |
| 9 | x 2 | packages/metro/srcpackages/metro/src | 299:308 (<1%)993:1002 (<1%) | view | |
| 9 | x 2 | packages/metro/src/Delta...ler/Serializers/helperspackages/metro/src/Delta...ler/Serializers/helpers | 33:41 (33%)33:41 (33%) | view | |
| 8 | x 2 | packages/metro-symbolicate/srcpackages/metro-symbolicate/src | 264:272 (1%)879:887 (1%) | view | |
| 8 | x 2 | packages/metro/src/libpackages/metro/src/lib | 137:145 (6%)93:101 (9%) | view | |
| 8 | x 2 | packages/metro/src/libpackages/metro/src/lib | 117:125 (6%)93:101 (9%) | view | |
| 8 | x 2 | packages/metro/srcpackages/metro/src | 955:964 (<1%)1143:1152 (<1%) | view | |
| 8 | x 2 | packages/metro/src/ModuleGraph/workerpackages/metro/src/ModuleGraph/worker | 484:491 (1%)516:523 (1%) | view | |
| 8 | x 2 | packages/metro/src/libpackages/metro/src/lib | 60:68 (6%)93:101 (9%) | view | |
| 8 | x 2 | packages/metro/src/ModuleGraph/workerpackages/metro/src/ModuleGraph/worker | 500:507 (1%)516:523 (1%) | view | |
| 8 | x 2 | packages/metro-transform-worker/srcpackages/metro-transform-worker/src | 332:339 (1%)355:362 (1%) | view |
Duplicated Units
The list of top 1 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 11 | x 2 | packages/metro/src/Delta...ler/Serializers/helperspackages/metro/src/Delta...ler/Serializers/helpers | 17:29 17:29 | view |