Foobar
The terms foobar (/ˈfuːbɑːr/), or foo and others are used as placeholder names (also referred to as metasyntactic variables) in computer programming or computer-related documentation.[1] They have been used to name entities such as variables, functions, and commands whose exact identity is unimportant and serve only to demonstrate a concept.
History and etymology
According to the Internet Engineering Task Force (IETF) RFC 3092 the word FOO originated as a nonsense word with its earliest documented use in the 1930s comic Smokey Stover by Bill Holman.[1] Holman states that he used the word due to having seen it on bottom of a jade Chinese figurine in Chinatown, San Francisco, meaning "good luck".[2] This is presumably as a transliteration of the fu character (Mandarin: fú, Cantonese: fuk1, 福), which is a common character for fortune, and figurines of the trio of eponymous male "star gods" Fú, Lù, Shòu (Cantonese: fuk1 luk6 sau6, 福祿壽) are common in Chinese communities; compare Fu Manchu, fictional character popular in the 1930s. Smokey Stover ran 1935–73, and continued to feature foo prominently, as on the front of the "foomobile" illustrated in the cover at right. The word foo became popular in the 1930s, and also appeared in other cartoons including the Looney Tunes cartoons of Bob Clampett such as The Daffy Doc and Porky in Wackyland (both 1938, with Daffy Duck and Porky Pig), and in other comic strips such as Pogo.
The military slang FUBAR[1] and snafu appeared later. foo fighter was used by Allied aircraft pilots in World War II to describe various UFOs or mysterious aerial phenomena.
The use of foo in a programming context is generally credited to the Tech Model Railroad Club (TMRC) of MIT from circa 1960.[1] However, the precise relationship of these terms is not known with certainty, and several anecdotal theories have been advanced to identify them.
The first known use of the terms in print in a programming context appears in a 1965 edition of MIT's Tech Engineering News.[3] Foobar may have come about as a result of the pre-existing "Foo" being conjoined with "bar" an addition borrowed from the military's FUBAR. The use of foo in hacker and eventually in programming context may have begun in MIT's Tech Model Railroad Club (TMRC). In the complex model system, there were scram switches located at numerous places around the room that could be thrown if something undesirable was about to occur, such as a train going full-bore at an obstruction. Another feature of the system was a digital clock on the dispatch board. When someone hit a scram switch, the clock stopped and the display was replaced with the word "FOO"; at TMRC the scram switches are, therefore, called "Foo switches". Because of this, an entry in the 1959 Dictionary of the TMRC Language went something like this: "FOO: The first syllable of the misquoted sacred chant phrase 'foo mane padme hum.' Our first obligation is to keep the foo counters turning."[4] One book describing the MIT train room describes two buttons by the door: labeled "foo" and "bar". These were general purpose buttons and were often re-purposed for whatever fun idea the MIT hackers had at the time, hence the adoption of foo and bar as general purpose variable names. An entry in the Abridged Dictionary of the TMRC Language states:[5]
Multiflush: stop-all-trains-button. Next best thing to the red door button. Also called FOO. Displays "FOO" on the clock when used.
The term foobar was propagated through computer science circles in the 1960s and early 1970s by system manuals from Digital Equipment Corporation. Foobar was also used as a variable name in the Fortran code of Colossal Cave Adventure (1977 Crowther and Woods version). The variable FOOBAR was used to contain the player's progress in saying the magic phrase "Fee Fie Foe Foo".
Example usage in code
In this Hello World code sample, foo and bar are used to illustrate string concatenation:
/* C code */
#include <stdio.h>
int main()
{
const char *foo = "Hello";
const char *bar = "World!";
fprintf(stdout, "%s %s\n", foo, bar);
return 0;
}
Usage in speech
The terms are used in speech in an analogous way, although older synonyms may be used. For example, "Some function foo will then be called". In these cases, foo and bar are synonyms for whatever or whichever. Or: "A database record for user foo" is synonymous with: "A database record for user whoever".
Usage in culture
Foo Camp is an annual hacker convention.
During the United States v. Microsoft Corp. trial, some evidence was presented that Microsoft had tried to use the Web Services Interoperability organization as a means to stifle competition, including e-mails in which top executives including Bill Gates referred to the WS-I using the codename "foo".[6]
These terms gave the name to foobar2000, an audio player independently developed using C++, as its author was more focused on producing a functional program than on aesthetics.
There is a character named "Master Foo" in Rootless Root, a collection of hacker koans.
Google released https://google.com/foobar in November 2014.
See also
References
- 1 2 3 4 Eastlake, D; Manros, C; Raymond, E. "Etymology of "Foo"". The Internet Engineering Task Force. Retrieved 17 April 2016.
- ↑ "The History of Bill Holman". www.smokey-stover.com. Retrieved 2016-04-17.
- ↑ Tech Engineering News, Volume 47. Massachusetts Institute of Technology. 1965. p. 63.
Further, it is possible to search for an effective address; e.g., if an instruction such as "add 1 foo" were used, specifying indirect addressing thru location "foo", and location "foo" contained the address of location "foobar", than an effective word search for "foobar" would find location "foo" and the location containing the "add" instruction as well.
- ↑ "Computer Dictionary Online"., computer-dictionary-online.org
- ↑ "Abridged Dictionary of the TMRC Language". MIT.
- ↑ Microsoft ploy to block Sun exposed, news.com
External links
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Look up foobar, foo, or bar in Wiktionary, the free dictionary. |
- The Jargon File entry on "foobar", catb.org
- RFC 1639 – FTP Operation Over Big Address Records (FOOBAR)