Type variance

Variance - relationship between a generic type or a function and a component type on subtyping. Article “Type variance” in English Wikipedia has 58.3 points for quality (as of July 1, 2026). The article contains 41 references and 20 sections. The article also contains templates indicating quality issues, therefore its score was reduced by 14.58 points.

In this language version of Wikipedia the article has the best quality. Also, this article is the most popular in that (English) language version.

In June 2026 the article “Type variance” was edited by 2 authors in English Wikipedia and written by 2 authors in all languages.

Since the creation of article “Type variance”, its content was written by 181 registered users of English Wikipedia and edited by 317 registered Wikipedia users in all languages.

The article is cited 33 times in English Wikipedia and cited 104 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #19499 in May 2004
• Global: #39799 in August 2016

The highest popularity rank from 2008:

• Local (English): #90343 in August 2014
• Global: #140402 in August 2014

There are 13 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2026 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	English (en) Type variance		58.3102
2	Chinese (zh) 协变与逆变		52.4956
3	Persian (fa) هم‌وردایی و پادوردایی (علوم رایانه)		29.263
4	Italian (it) Covarianza e controvarianza (informatica)		28.686
5	Finnish (fi) Varianssi (tietotekniikka)		28.6391
6	Spanish (es) Covarianza y contravarianza (ciencias de la computación)		25.6065
7	Korean (ko) 공변성과 반공변성 (컴퓨터 과학)		24.8075
8	French (fr) Variance (informatique)		23.5076
9	German (de) Kovarianz und Kontravarianz		21.6351
10	Russian (ru) Ковариантность и контравариантность (программирование)		18.3282

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The following table shows the most popular language versions of the article.

The most popular language versions of the article "Type variance" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Type variance		1 315 993
2	Russian (ru) Ковариантность и контравариантность (программирование)		204 798
3	German (de) Kovarianz und Kontravarianz		176 589
4	Chinese (zh) 协变与逆变		68 695
5	Japanese (ja) 共変性と反変性 (計算機科学)		41 631
6	Italian (it) Covarianza e controvarianza (informatica)		9 355
7	Arabic (ar) لاتباين وتباين مرافق وتباين معاكس		8 444
8	Spanish (es) Covarianza y contravarianza (ciencias de la computación)		6 919
9	Ukrainian (uk) Коваріантність і контраваріантність (програмування)		6 328
10	Korean (ko) 공변성과 반공변성 (컴퓨터 과학)		3 923

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The following table shows the language versions of the article with the highest popularity in the last month.

The most popular language versions of the article "Type variance" in June 2026

#	Language	Popularity award	Relative popularity
1	English (en) Type variance		2 224
2	Russian (ru) Ковариантность и контравариантность (программирование)		296
3	Chinese (zh) 协变与逆变		171
4	German (de) Kovarianz und Kontravarianz		165
5	Japanese (ja) 共変性と反変性 (計算機科学)		89
6	French (fr) Variance (informatique)		37
7	Italian (it) Covarianza e controvarianza (informatica)		24
8	Korean (ko) 공변성과 반공변성 (컴퓨터 과학)		18
9	Persian (fa) هم‌وردایی و پادوردایی (علوم رایانه)		17
10	Ukrainian (uk) Коваріантність і контраваріантність (програмування)		14

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The following table shows the language versions of the article with the highest Authors’ Interest.

Language versions of the article "Type variance" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Type variance		181
2	German (de) Kovarianz und Kontravarianz		51
3	Japanese (ja) 共変性と反変性 (計算機科学)		19
4	Chinese (zh) 协变与逆变		18
5	Arabic (ar) لاتباين وتباين مرافق وتباين معاكس		10
6	Italian (it) Covarianza e controvarianza (informatica)		8
7	Russian (ru) Ковариантность и контравариантность (программирование)		8
8	Spanish (es) Covarianza y contravarianza (ciencias de la computación)		5
9	Persian (fa) هم‌وردایی و پادوردایی (علوم رایانه)		5
10	Ukrainian (uk) Коваріантність і контраваріантність (програмування)		5

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The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

Language versions of the article "Type variance" with the highest AI in June 2026

#	Language	AI award	Relative AI
1	English (en) Type variance		2
2	Arabic (ar) لاتباين وتباين مرافق وتباين معاكس		0
3	German (de) Kovarianz und Kontravarianz		0
4	Spanish (es) Covarianza y contravarianza (ciencias de la computación)		0
5	Persian (fa) هم‌وردایی و پادوردایی (علوم رایانه)		0
6	Finnish (fi) Varianssi (tietotekniikka)		0
7	French (fr) Variance (informatique)		0
8	Italian (it) Covarianza e controvarianza (informatica)		0
9	Japanese (ja) 共変性と反変性 (計算機科学)		0
10	Korean (ko) 공변성과 반공변성 (컴퓨터 과학)		0

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The following table shows the language versions of the article with the highest number of citations.

Language versions of the article "Type variance" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) Type variance		33
2	German (de) Kovarianz und Kontravarianz		13
3	Chinese (zh) 协变与逆变		12
4	Russian (ru) Ковариантность и контравариантность (программирование)		10
5	Japanese (ja) 共変性と反変性 (計算機科学)		9
6	Persian (fa) هم‌وردایی و پادوردایی (علوم رایانه)		5
7	Korean (ko) 공변성과 반공변성 (컴퓨터 과학)		5
8	Ukrainian (uk) Коваріантність і контраваріантність (програмування)		5
9	French (fr) Variance (informatique)		4
10	Arabic (ar) لاتباين وتباين مرافق وتباين معاكس		3

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#	Language	Value
ar	Arabic لاتباين وتباين مرافق وتباين معاكس
de	German Kovarianz und Kontravarianz
en	English Type variance
es	Spanish Covarianza y contravarianza (ciencias de la computación)
fa	Persian هم‌وردایی و پادوردایی (علوم رایانه)
fi	Finnish Varianssi (tietotekniikka)
fr	French Variance (informatique)
it	Italian Covarianza e controvarianza (informatica)
ja	Japanese 共変性と反変性 (計算機科学)
ko	Korean 공변성과 반공변성 (컴퓨터 과학)
ru	Russian Ковариантность и контравариантность (программирование)
uk	Ukrainian Коваріантність і контраваріантність (програмування)
zh	Chinese 协变与逆变

Best Rank

English: #90343 08.2014

Global: #140402 08.2014

Best Rank

English: #19499 05.2004

Global: #39799 08.2016

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In English Wikipedia the most popular articles on that day were: 2026 FIFA World Cup, Harry Kane, Julián Quiñones, List of FIFA World Cup top goalscorers, Kylian Mbappé, Democratic Republic of the Congo, Erling Haaland, DR Congo national football team, Melat Kiros, FIFA World Cup.

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information