Duplication · guardian/aus-lobbying-scroller-2018

Duplication Overall

2,139 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
328 duplicated lines

Duplication per Extension

Duplication per Component (primary)

Longest Duplicates

The list of 19 longest duplicates.

Size	#	Folders	Files	Lines	Code
25	x 2	src/js src/js	createScroller.js old.js	419:448 (4%) 209:238 (9%)	view
16	x 2	src/js src/js	createScroller.js old.js	472:496 (2%) 262:286 (6%)	view
15	x 2	src/js src/js	createScroller.js old.js	264:280 (2%) 77:93 (5%)	view
15	x 2	src/js src/js	createScroller.js old.js	302:323 (2%) 116:137 (5%)	view
13	x 2	src/js src/js	createScroller.js old.js	283:300 (2%) 97:114 (4%)	view
12	x 2	src/js src/js	createScroller.js createScroller.js	284:300 (2%) 307:323 (2%)	view
12	x 2	src/js src/js	old.js old.js	98:114 (4%) 121:137 (4%)	view
12	x 2	src/js src/js	createScroller.js old.js	284:300 (2%) 121:137 (4%)	view
12	x 2	src/js src/js	createScroller.js old.js	307:323 (2%) 98:114 (4%)	view
11	x 2	src/js src/js	createScroller.js old.js	755:768 (1%) 291:304 (4%)	view
10	x 2	src/js src/js	createScroller.js createScroller.js	702:713 (1%) 722:733 (1%)	view
9	x 2	src/js src/js	createScroller.js createScroller.js	610:620 (1%) 658:668 (1%)	view
8	x 2	ROOT ROOT	gulpfile.babel.js gulpfile.babel.js	210:217 (3%) 220:227 (3%)	view
8	x 2	ROOT ROOT	gulpfile.babel.js gulpfile.babel.js	259:268 (3%) 276:285 (3%)	view
8	x 2	src/js src/js	createScroller.js old.js	349:359 (1%) 163:173 (3%)	view
7	x 2	src/js src/js	createScroller.js createScroller.js	193:202 (1%) 217:226 (1%)	view
7	x 2	src/js src/js	createScroller.js old.js	179:187 (1%) 50:58 (2%)	view
6	x 2	src/js src/js	createScroller.js old.js	391:398 (1%) 197:204 (2%)	view
6	x 2	src/css src/css	_grid.css main.scss	6:11 (8%) 260:265 (1%)	view

Most Frequent Duplicates

The list of 7 most frequently found duplicates.

Size	#	Folders	Files	Lines	Code
6	x 4	src/js src/js src/js src/js	createScroller.js old.js old.js createScroller.js	285:293 (1%) 99:107 (2%) 122:130 (2%) 308:316 (1%)	view
6	x 4	src/js src/js src/js src/js	createScroller.js old.js old.js createScroller.js	286:294 (1%) 100:108 (2%) 123:131 (2%) 309:317 (1%)	view
6	x 4	src/js src/js src/js src/js	createScroller.js old.js old.js createScroller.js	284:290 (1%) 98:104 (2%) 121:127 (2%) 307:313 (1%)	view
6	x 4	src/js src/js src/js src/js	createScroller.js old.js old.js createScroller.js	290:299 (1%) 104:113 (2%) 127:136 (2%) 313:322 (1%)	view
6	x 4	src/js src/js src/js src/js	createScroller.js old.js old.js createScroller.js	289:297 (1%) 103:111 (2%) 126:134 (2%) 312:320 (1%)	view
6	x 4	src/js src/js src/js src/js	createScroller.js old.js old.js createScroller.js	293:300 (1%) 107:114 (2%) 130:137 (2%) 316:323 (1%)	view
6	x 4	src/js src/js src/js src/js	createScroller.js old.js old.js createScroller.js	287:296 (1%) 101:110 (2%) 124:133 (2%) 310:319 (1%)	view

Duplicated Units

The list of top 1 duplicated units.

Size	#	Folders	Files	Lines	Code
13	x 2	src/js src/js	createScroller.js old.js	266:281 79:94	view

About This Analysis

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.

Learn more...

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!"

"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."