知识点滴 - Foo, bar和slang

Foobar本身是一个俚语或俗语，英文里叫做slang。

slang

a type of language that consists of words and phrases that are regarded as very informal, are more common in speech than writing, and are typically restricted to a particular context or group of people.

一种由被认为是非常非正式的单词或短语组成的语言类型，更常见于口语, 少见于书面语，通常仅限于特定的语境或人群。

Foobar的介绍如下：

术语foobar（/ˈfuːbɑːr/）在计算机编程或计算机相关文档中被用作元语法变量和占位符名称。它们被用来命名实体，如变量、函数和命令，其确切身份并不重要，只是为了展示一个概念。

The terms foobar (/ˈfuːbɑːr/) are used as metasyntactic variables and placeholder names 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.

Foobar有可能是对二战时期军事俚语FUBAR（Fucked Up Beyond All Recognition）的俏皮暗示，意思是事情搞得一团糟，都面目全非了。

或者是二战时美军里有的说法：Fouled(Fucked) up beyond all repair，表示情况或东西已经被搞坏了，没法挽救了。

Fouled up beyond all repair (FUBAR) is a slang term that originated and was popularized during World War II by American soldiers. The term means that a situation or object is so messed up that it is beyond being salvageable.

第一个已知的在编程背景下的印刷品使用出现在1965年的麻省理工学院的《技术工程新闻》中。在编程时使用foo通常归功于麻省理工学院的技术模型铁路俱乐部（TMRC），大约在1960年。

所以，我们经常在一些编程例子中看到foo，bar这些词汇用作函数或变量名。

参考：

https://en.wikipedia.org/wiki/Foobar