Camel case (sometimes stylized autologically as camelCase or CamelCase, also known as camel caps or more formally as medial capitals) is a writing format practice of writing phrases with capitalized words lacking spaces or punctuation. The practice has various names and conventions. The earliest known occurrence of a term for this style, InterCaps, was on Usenet in April 1990.
The use of medial capitals as a convention in the regular spelling of everyday texts is rare, but is used in some languages as a solution to particular problems which arise when two words or segments are combined. In the scholarly transliteration of languages written in other scripts, medial capitals are used in similar situations. Medial capitals are sometimes traditionally used in abbreviations to reflect the capitalization that the words would have when written out in full, and they have come into use in unpunctuated abbreviations of academic titles, such as PhD and BSc, which now often replace Ph.D. and B.Sc.
The first systematic and widespread use of medial capitals for technical purposes was the notation for chemical formulas invented by the Swedish chemist Jacob Berzelius in 1813. Since the early 20th century, medial capitals have occasionally been used for corporate names and product trademarks. In the 1970s and 1980s, medial capitals were adopted as a standard or alternative naming convention for multi-word in several computer . The use of medial caps for compound identifiers is recommended by the guidelines of many organizations and software projects. Camel case has been criticized as impairing readability, as it creates long compound words strewn with capital letters.
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Camel case (sometimes stylized autologically as camelCase or CamelCase, also known as camel caps or more formally as medial capitals) is a writing format practice of writing phrases with capitalized words lacking spaces or punctuation.
camel caps
Camel case (sometimes stylized autologically as camelCase or CamelCase, also known as camel caps or more formally as medial capitals) is a writing format practice of writing phrases with capitalized words lacking spaces or punctuation.
medial capitals
Camel case (sometimes stylized autologically as camelCase or CamelCase, also known as camel caps or more formally as medial capitals) is a writing format practice of writing phrases with capitalized words lacking spaces or punctuation.
The more specific terms Pascal case and upper camel case refer to a joined phrase where the first letter of each word is capitalized, including the initial letter of the first word.
The more specific terms Pascal case and upper camel case refer to a joined phrase where the first letter of each word is capitalized, including the initial letter of the first word.
In German, many nouns denoting people lack a gender-neutral form, which is why often, especially colloquially, the male form of a noun is used generically to address everyone, regardless of their gender (this is called generisches Maskulinum in German).
Another, more recent approach is using the medial capital letter I, called Binnen-I, in written text for words like StudentInnen ("students") to indicate that both Studenten ("male students") and Studentinnen ("female students") are referred to simultaneously.
Terms the article defines in bold, quoted in context.
Categories:
Capitalization
Naming conventions
Typography
Source code
Metaphors referring to camels
3,495 words · 46 references · revision 1384734799 · CC BY-SA 4.0
The writing format camel case is the practice of writing phrases without spaces or punctuation and with capitalized words. The first word starts with either case, then the following words have an initial uppercase letter. Common examples include YouTube,1PowerPoint, HarperCollins, FedEx, iPhone, eBay,2 and LaGuardia.3 Camel case is often used as a naming convention in computer programming. It is also sometimes used in online usernames such as JohnSmith, and to make multi-word domain names more legible, for example in promoting EasyWidgetCompany.com.
The more specific terms Pascal case and upper camel case refer to a joined phrase where the first letter of each word is capitalized, including the initial letter of the first word. Similarly, lower camel case (also known as dromedary case) requires an initial lowercase letter. Some people and organizations, notably Microsoft, use the term camel case only for lower camel case, designating the upper camel case separately as Pascal case.4 Some programming styles prefer camel case with the first letter capitalized, others not.546 For clarity, this article leaves the definition of camel case ambiguous with respect to capitalization of the first word, and uses the more specific terms when necessary.
Camel case is distinct from several other styles: title case, which capitalizes all words but retains the spaces between them; Tall Man lettering, which uses capitals to emphasize the differences between similar-looking product names such as predniSONE and predniSOLONE; and snake case, which uses underscores interspersed with lowercase letters (sometimes with the first letter capitalized). A combination of snake and camel case (identifiers Written_Like_This) is recommended in the Ada 95 style guide.7
The earliest known occurrence of the term InterCaps on Usenet is in an April 1990 post to the group alt.folklore.computers by Avi Rappoport.22 The earliest use of the name "Camel Case" occurs in 1995, in a post by Newton Love.23 Love has since said, "With the advent of programming languages having these sorts of constructs, the humpiness of the style made me call it HumpyCase at first, before I settled on CamelCase. I had been calling it CamelCase for years. ... The citation above was just the first time I had used the name on USENET."24 The term "Pascal Case" was coined in design discussions for the .NET Framework, first released in 2002.25
Traditional use in natural language
In word combinations
The use of medial capitals as a convention in the regular spelling of everyday texts is rare, but is used in some languages as a solution to particular problems which arise when two words or segments are combined.
In Italian, pronouns can be suffixed to verbs, and because the honorific form of second-person pronouns is capitalized, this can produce a sentence like non ho trovato il tempo di risponderLe ("I have not found time to answer you" – where Le means "to you").
In German, many nouns denoting people lack a gender-neutral form, which is why often, especially colloquially, the male form of a noun is used generically to address everyone, regardless of their gender (this is called generisches Maskulinum in German). Another, more recent approach is using the medial capital letter I, called Binnen-I, in written text for words like StudentInnen ("students") to indicate that both Studenten ("male students") and Studentinnen ("female students") are referred to simultaneously. However, mid-word capitalization does not conform to the German orthography prescribed by the Rat für deutsche Rechtschreibung (Council for German Orthography) apart from proper names like McDonald. In order to adhere to orthography, the introductory "students" example could be corrected using parentheses to Student(inn)en, which is analogous to writing "congress(wo)men" in English.26
In Irish, camel case is used when an inflectional prefix is attached to a proper noun, for example ("in "), from ("Galway"); ("the Scottish person"), from ("Scottish person"); and ("to Ireland"), from ("Ireland"). In recent , a hyphen has been inserted: .
History of modern technical use
Chemical formulas
The first systematic and widespread use of medial capitals for technical purposes was the notation for chemical formulas invented by the Swedish chemist Jacob Berzelius in 1813. To replace the multitude of naming and symbol conventions used by chemists until that time, he proposed to indicate each chemical element by a symbol of one or two letters, the first one being capitalized. The capitalization allowed formulas like "NaCl" to be written without spaces and still be parsed without ambiguity.2829
Berzelius' system continues to be used, augmented with three-letter symbols such as "Uue" for unconfirmed or unknown elements and abbreviations for some common substituents (especially in the field of organic chemistry, for instance "Et" for "ethyl-"). This has been further extended to describe the amino acid sequences of proteins and other similar domains.
Early use in trademarks
Since the early 20th century, medial capitals have occasionally been used for corporate names and product trademarks, such as
DryIce Corporation (1925) marketed the solid form of carbon dioxide (CO2) as "Dry Ice", thus leading to its common name.30
The use of medial caps for compound identifiers is recommended by the coding style guidelines of many organizations or software projects. For some languages (such as Mesa, Pascal, Modula, Java and Microsoft's .NET) this practice is recommended by the language developers or by authoritative manuals and has therefore become part of the language's "culture".
Style guidelines often distinguish between upper and lower camel case, typically specifying which variety should be used for specific kinds of entities: variables, record fields, methods, procedures, functions, subroutines, types, etc. These rules are sometimes supported by static analysis tools that check for adherence.
Readability studies
A 2009 study of 135 subjects comparing snake case (underscored identifiers) to camel case found that camel case identifiers were recognized with higher accuracy among all subjects. Subjects recognized snake case identifiers more quickly than camel case identifiers. Training in camel case sped up camel case recognition and slowed snake case recognition, although this effect involved coefficients with high p-values. The study also conducted a subjective survey and found that non-programmers either preferred underscores or had no preference, and 38% of programmers trained in camel case stated a preference for underscores. However, these preferences had no statistical correlation to accuracy or speed when controlling for other variables.45
A 2010 follow-up study used a similar study design with 15 subjects consisting of expert programmers trained primarily in snake case. It used a static rather than animated stimulus and found perfect accuracy in both styles except for one incorrect camel case response. Subjects recognized identifiers in snake case more quickly than camel case. The study used eye-tracking equipment and found that the difference in speed for its subjects was primarily due to the fact that average duration of fixations for camel-case was significantly higher than that of snake case for 3-part identifiers. The survey recorded a mixture of preferred identifier styles but again there was no correlation of preferred style to accuracy or speed.46
In Chinese pinyin, camel case is sometimes used for place names so that readers can more easily pick out the different parts of the name. For example, places like Beijing (北京), Qinhuangdao (秦皇岛), and Daxing'anling (大兴安岭) can be written as BeiJing, QinHuangDao, and DaXingAnLing respectively, with the number of capital letters equaling the number of Chinese characters. Writing word compounds only by the initial letter of each character is also acceptable in some cases, so Beijing can be written as BJ, Qinghuangdao as QHD, and Daxing'anling as DXAL.
In English, medial capitals are usually only found in Scottish or Irish "Mac-" or "Mc-" patronymic names, where for example MacDonald, McDonald, and Macdonald are common spelling variants of MacDonald (son of Dòmhnall), and in Anglo-Norman "Fitz-" names, where for example both FitzGerald and Fitzgerald (son of Gerald) are found.
In their English style guide The King's English, first published in 1906, H. W. and F. G. Fowler suggested that medial capitals could be used in triple compound words where hyphens would cause ambiguity—the examples they give are KingMark-like (as against King Mark-like) and Anglo-SouthAmerican (as against Anglo-South American). However, they described the system as "too hopelessly contrary to use at present".27
In the scholarly transliteration of languages written in other scripts, medial capitals are used in similar situations. For example, in transliterated Hebrew, haIvri means "the Hebrew person" or "the Jew" and b'Yerushalayim means "in Jerusalem". In Tibetan proper names like rLobsang, the "r" stands for a prefix glyph in the original script that functions as tone marker rather than a normal letter. Another example is tsIurku, a Latin transcription of the Chechen term for the capping stone of the characteristic Medieval defensive towers of Chechnya and Ingushetia; the letter "I" (palochka) is not actually capital, denoting a phoneme distinct from the one transcribed as "i".
In abbreviations
Medial capitals are traditionally used in abbreviations to reflect the capitalization that the words would have when written out in full, for example in the academic titles PhD or BSc. A more recent example is NaNoWriMo, a contraction of National Novel Writing Month and the designation for both the annual event and the nonprofit organization that runs it. In German, the names of statutes are abbreviated using embedded capitals, e.g. StGB for Strafgesetzbuch (Criminal Code), PatG for Patentgesetz (Patent Act), BVerfG for Bundesverfassungsgericht (Federal Constitutional Court), or the very common GmbH, for Gesellschaft mit beschränkter Haftung (private limited company). In this context, there can even be three or more camel case capitals, e.g. in TzBfG for Teilzeit- und Befristungsgesetz (Act on Part-Time and Limited Term Occupations). In French, camel case acronyms such as OuLiPo (1960) were favored for a time as alternatives to initialisms.
Camel case is often used to transliterate initialisms into alphabets where two letters may be required to represent a single character of the original alphabet, e.g., DShK from Cyrillic ДШК.
widescreen
ShopKo (1962), retail stores, later renamed Shopko
In the 1970s and 1980s, medial capitals were adopted as a standard or alternative naming convention for multi-word identifiers in several programming languages. The precise origin of the convention in computer programming has not yet been settled. A 1954 conference proceedings33 occasionally informally referred to IBM's Speedcoding system as "SpeedCo". Christopher Strachey's paper on GPM (1965),34 shows a program that includes some medial capital identifiers, including "NextCh" and "WriteSymbol" (This was most likely the influence of the CPL language, of which Strachey was one of the designers)
Multiple-word descriptive identifiers with embedded spaces such as end of file or char table cannot be used in most programming languages because the spaces between the words would be parsed as delimiters between tokens. The alternative of running the words together as in endoffile or chartable is difficult to understand and possibly misleading; for example, chartable is an English word (able to be charted), whereas charTable means a table of chars .
Some early programming languages, notably Lisp (1958) and COBOL (1959), addressed this problem by allowing a hyphen ("-") to be used between words of compound identifiers, as in "END-OF-FILE": Lisp because it worked well with prefix notation (a Lisp parser would not treat a hyphen in the middle of a symbol as a subtraction operator) and COBOL because its operators were individual English words. This convention remains in use in these languages, and is also common in program names entered on a command line, as in Unix.
However, this solution was not adequate for mathematically oriented languages such as FORTRAN (1955) and ALGOL (1958), which used the hyphen as an infix subtraction operator. FORTRAN ignored blanks altogether, so programmers could use embedded spaces in variable names. However, this feature was not very useful since the early versions of the language restricted identifiers to no more than six characters.
Exacerbating the problem, common punched card character sets of the time were uppercase only and lacked other special characters. It was only in the late 1960s that the widespread adoption of the ASCII character set made both lowercase and the underscore character _ universally available. Some languages, notably C, promptly adopted underscores as word separators, and identifiers such as end_of_file are still prevalent in C programs and libraries (as well as in later languages influenced by C, such as Perl and Python). However, some languages and programmers chose to avoid underscores and adopted camel case instead.
Charles Simonyi, who worked at Xerox PARC in the 1970s and later oversaw the creation of Microsoft's Office suite of applications, invented and taught the use of Hungarian Notation, one version of which uses the lowercase letter(s) at the start of a (capitalized) variable name to denote its type. One account claims that the camel case style first became popular at Xerox PARC around 1978, with the Mesa programming language developed for the Xerox Alto computer. This machine lacked an underscore key (whose place was taken by a left arrow "←"), and the hyphen and space characters were not permitted in identifiers, leaving camel case as the only viable scheme for readable multiword names. The PARC Mesa Language Manual (1979) included a coding standard with specific rules for upper and lower camel case that was strictly followed by the Mesa libraries and the Alto operating system. Niklaus Wirth, the inventor of Pascal, came to appreciate camel case during a sabbatical at PARC and used it in Modula, his next programming language.35
The Smalltalk language, which was developed originally on the Alto, also uses camel case instead of underscores. This language became quite popular in the early 1980s, and thus may also have been instrumental in spreading the style outside PARC.
Upper camel case (or "Pascal case") is used in Wolfram Language in computer algebraic system Mathematica for predefined identifiers. User defined identifiers should start with a lower case letter. This avoids the conflict between predefined and user defined identifiers both today and in all future versions.
C# variable names are recommended to follow the lower camel case convention.36
Computer companies and products
Whatever its origins in the computing field, the convention was used in the names of computer companies and their commercial brands, since the late 1970s – a trend that continues to this day:
(1990) WorldWideWeb (the first web browser), later renamed Nexus
Spread to mainstream usage
In the 1980s and 1990s, after the advent of the personal computer exposed hacker culture to the world, camel case then became fashionable for corporate trade names in non-computer fields as well. Mainstream usage was well established by 1990:
During the dot-com bubble of the late 1990s, the lowercase prefixes "e" (for "electronic") and "i" (for "Internet",37 "information", "intelligent", etc.) became quite common, giving rise to names like Apple's iMac and the eBox software platform.
In 1998, Dave Yost suggested that chemists use medial capitals to aid readability of long chemical names, e.g. write AmidoPhosphoRibosylTransferase instead of amidophosphoribosyltransferase.38 This usage was not widely adopted.
Camel case is sometimes used for abbreviated names of certain neighborhoods, e.g. New York City neighborhoods SoHo (South of Houston Street) and TriBeCa (Triangle Below Canal Street) and San Francisco's SoMa (South of Market). Such usages erode quickly, so the neighborhoods are now typically rendered as Soho, Tribeca, and Soma.
Internal capitalization has also been used for other technical codes like HeLa (1983).
source code
The original Hungarian notation for programming, for example, specifies that a lowercase abbreviation for the "usage type" (not data type) should prefix all variable names, with the remainder of the name in upper camel case; as such it is a form of lower camel case.
Programming identifiers often need to contain acronyms and initialisms that are already in uppercase, such as "old HTML file". By analogy with the title case rules, the natural camel case rendering would have the abbreviation all in uppercase, namely "oldHTMLFile". However, this approach is problematic when two acronyms occur together (e.g., "parse DBM XML" would become "parseDBMXML") or when the standard mandates lower camel case but the name begins with an abbreviation (e.g. "SQL server" would become "sQLServer"). For this reason, some programmers prefer to treat abbreviations as if they were words and write "oldHtmlFile", "parseDbmXml" or "sqlServer".39 However, this can make it harder to recognize that a given word is intended as an acronym.40
Difficulties arise when identifiers have different meaning depending only on the case, as can occur with mathematical functions or trademarks. In this situation changing the case of an identifier might not be an option and an alternative name need be chosen.
Wiki link markup
Camel case is used in some wiki markup languages for terms that should be automatically linked to other wiki pages. This convention was originally used in Ward Cunningham's original wiki software, WikiWikiWeb,41 and can be activated in most other wikis. Some wiki engines such as TiddlyWiki, Trac and PmWiki make use of it in the default settings, but usually also provide a configuration mechanism or plugin to disable it. Wikipedia formerly used camel case linking as well, but switched to explicit link markup using square brackets42 and many other wiki sites have done the same. MediaWiki, for example, does not support camel case for linking. Some wikis that do not use camel case linking may still use the camel case as a naming convention, such as AboutUs.
Other uses
The NIEM registry requires that XML data elements use upper camel case and XML attributes use lower camel case.
Most popular command-line interfaces and scripting languages cannot easily handle file names that contain embedded spaces (usually requiring the name to be put in quotes). Therefore, users of those systems often resort to camel case (or underscores, hyphens and other "safe" characters) for compound file names like MyJobResume.pdf.
Social media accessibility
Microblogging and social networking services that limit the number of characters in a message are potential outlets for medial capitals. Using camel case between words reduces the number of spaces, and thus the number of characters, in a given message, allowing more content to fit into the limited space. Hashtags, especially long ones, often use camelCase or PascalCase to maintain readability (e.g. #collegeStudentProblems is easier to read than #collegestudentproblems);43 this practice improves accessibility as screen readers recognize camelCase and PascalCase in parsing composite hashtags.44
In website URLs, spaces are percent-encoded as "%20", making the address longer and less human readable. By omitting spaces, camel case does not have this problem.
14Iverson, Cheryl; Christiansen, Stacy; Flanagin, Annette; Fontanarosa, Phil B.; Glass, Richard M.; Gregoline, Brenda; Lurie, Stephen J.; Meyer, Harriet S.; Winker, Margaret A.; Young, Rozanne K., eds. (2007). AMA Manual of Style (10th ed.). Oxford, Oxfordshire: Oxford University Press. ISBN 978-0-19-517633-9.
26Richtiges und gutes Deutsch: Das Wörterbuch der sprachlichen Zweifelsfälle. Duden (in German). Vol. 9 (7th ed.). Mannheim: Bibliographisches Institut. 2011. p. 418. ISBN 978-3411040971.
28Jöns Jacob Berzelius (1813). Essay on the Cause of Chemical Proportions and on Some Circumstances Relating to Them: Together with a Short and Easy Method of Expressing Them. Annals of Philosophy 2, 443-454, 3, 51-52; (1814) 93-106, 244-255, 353-364.
29Henry M. Leicester & Herbert S. Klickstein, eds. 1952, A Source Book in Chemistry, 1400-1900 (Cambridge, MA: Harvard)
40Dave Binkley; Marcia Davis; Dawn Lawrie; Christopher Morrell (2009). "To CamelCase or Under_score". IEEE 17th International Conference on Program Comprehension, 2009. ICPC '09. IEEE: 158–167. “In terms of camel-cased identifiers, this has a greater impact on identifiers that include short words and especially acronyms. For example, consider the acronym ID found in the identifier kIOuterIIDPath. Because of the run of uppercase letters, the task of reading kIOuterIIDPath, in particular the identification of the word ID, is more difficult.”
41Andrew Lih, The Wikipedia Revolution: How a Bunch of Nobodies Created the World's Greatest Encyclopedia (New York: Hyperion, 2009), pp. 57–58.
45Dave Binkley; Marcia Davis; Dawn Lawrie; Christopher Morrell (2009). "To CamelCase or Under_score". IEEE 17th International Conference on Program Comprehension, 2009. ICPC '09. IEEE: 158–167. “The experiment builds on past work of others who study how readers of natural language perform such tasks. Results indicate that camel casing leads to higher accuracy among all subjects regardless of training, and those trained in camel casing are able to recognize identifiers in the camel case style faster than identifiers in the underscore style.”
46Bonita Sharif; Jonathan I. Maletic (2010). "An Eye Tracking Study on camelCase and under_score Identifier Styles". 2010 IEEE 18th International Conference on Program Comprehension. IEEE. pp. 196–205. doi:10.1109/ICPC.2010.41. ISBN 978-1-4244-7604-6. S2CID14170019. (download PDF). “An empirical study to determine if identifier-naming conventions (i.e., camelCase and under_score) affect code comprehension is presented. An eye tracker is used to capture quantitative data from human subjects during an experiment. The intent of this study is to replicate a previous study published at ICPC 2009 (Binkley et al.) that used a timed response test method to acquire data. The use of eye-tracking equipment gives additional insight and overcomes some limitations of traditional data gathering techniques. Similarities and differences between the two studies are discussed. One main difference is that subjects were trained mainly in the underscore style and were all programmers. While results indicate no difference in accuracy between the two styles, subjects recognize identifiers in the underscore style more quickly.”
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