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Concept
Foobar
Summary
The terms foobar (ˈfuːbɑr), foo, bar, baz, and others are used as metasyntactic variables and placeholder names in computer programming or computer-related documentation. 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.
The style guide for Google developer documentation recommends against using them as example project names, because they are unclear and can cause confusion.
It is possible that foobar is a playful allusion to the World War II-era military slang FUBAR (Fucked Up Beyond All Recognition).
According to an Internet Engineering Task Force RFC, the word FOO originated as a nonsense word with its earliest documented use in the 1930s comic Smokey Stover by Bill Holman. Holman states that he used the word due to having seen it on the bottom of a jade Chinese figurine in San Francisco Chinatown, purportedly signifying "good luck". If true, this is presumably related to the Chinese word fu ("福", sometimes transliterated foo, as in foo dog), which can mean happiness or blessing.
The first known use of the terms in print in a programming context appears in a 1965 edition of MIT's Tech Engineering News. The use of foo in a programming context is generally credited to the Tech Model Railroad Club (TMRC) of MIT from circa 1960. 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 moving at full power towards 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.
Official source
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