Scala 在名称中下划线 [英] Scala underscores in names

问题描述

我阅读了多个样式指南和其他资源，指出在方法/变量/其他名称中使用下划线是个坏主意.

I've read multiple style guidelines and other resources stating it's a bad idea to use underscores in method/variable/other names.

这背后的技术原因是什么?

What are the technical reasons behind this?

我很习惯例如用 _ 预先添加辅助函数.还有一些我想公开的应该是私有的函数，以便我可以通过 REPL 访问它们.使用helper"后缀等其他命名约定似乎很麻烦.

I'm very accustomed to e.g. prepending helper functions with _. There are also functions that should be private that I want to make public so I can access them via the REPL. Other naming conventions like using a "helper" suffix just seem cumbersome.

任何想法将不胜感激！

推荐答案

通配符 _ 在 Scala 中被大量使用.所以:

The wildcard operator _ is used heavily in Scala. So:

xs map (_.x)  // Call the x method of every element
xs map (_x)   // Pass every element through the _x method

令人困惑.您必须非常仔细地查看下划线是否在前面.

is confusing. You have to look very carefully to see if the underscore is prepended.

但是，内部下划线更难混淆:

However, internal underscores are harder to confuse:

xs map (my_method)  // No similar form where _ stands for the list element

所以这些问题不那么严重，但是当人们在寻找闭包时，下划线仍然有点吸引眼球.这可能是他们不鼓励使用它们的原因，但说实话，我一直在使用它们，特别是在隐式 defs 和内部变量之类的东西中，它们在界面中不会有太多或任何暴露.

So these are less problematic, but the underscores still catch the eye a little when one is looking for closures. This is probably why they're discouraged, but to be honest, I use them all the time, particularly in things like implicit defs and internal variables where they won't have much or any exposure in an interface.

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