Duplication · guardian/old-2017-census-interactive

Duplication Overall

2,317 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
136 duplicated lines

Duplication per Extension

Duplication per Component (primary)

Longest Duplicates

The list of 10 longest duplicates.

Size	#	Folders	Files	Lines	Code
11	x 2	src/css src/css	main.scss main.scss	303:316 (1%) 954:967 (1%)	view
10	x 2	src/js/containers/results src/js/containers/results	index.js index.js	46:56 (16%) 69:80 (16%)	view
9	x 2	src/js/components/results src/js/components/results	results-footer.js results-header.js	21:29 (42%) 22:30 (40%)	view
8	x 2	ROOT ROOT	gulpfile.babel.js gulpfile.babel.js	200:209 (3%) 217:226 (3%)	view
8	x 2	src/js/components/search src/js/components/search	search-map.js search-map.js	136:144 (5%) 170:178 (5%)	view
7	x 2	src/js/components/results src/js/components/results	results-footer.js results-header.js	6:17 (33%) 6:17 (31%)	view
6	x 2	src/css src/css	main.scss main.scss	70:75 (<1%) 80:85 (<1%)	view
6	x 2	src/css src/css	main.scss main.scss	70:75 (<1%) 892:897 (<1%)	view
6	x 2	src/css src/css	main.scss main.scss	80:85 (<1%) 892:897 (<1%)	view
6	x 2	src/js/actions src/js/components/users	index.js users-form.js	48:53 (8%) 51:56 (4%)	view

Most Frequent Duplicates

The list of 1 most frequently found duplicates.

Size	#	Folders	Files	Lines	Code
6	x 3	src/css src/css src/css	main.scss main.scss main.scss	70:75 (<1%) 80:85 (<1%) 892:897 (<1%)	view

Duplicated Units

The list of top 1 duplicated units.

Size	#	Folders	Files	Lines	Code
7	x 2	src/js/components/users src/js/actions	users-form.js index.js	50:58 47:55	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."