一种测试期权价值的更好方法? [英] A better way to test the value of an Option?

问题描述

我经常发现自己的Option[T]类型为T，并且希望针对某个值测试选项的值.例如:

I often find myself with an Option[T] for some type T and wish to test the value of the option against some value. For example:

val opt = Some("oxbow")
if (opt.isDefined && opt.get == "lakes") 
   //do something

以下代码是等效的，删除了测试选项值的存在性的要求

The following code is equivalent and removes the requirement to test the existence of the value of the option

if (opt.map(_ == "lakes").getOrElse(false))
 //do something

但是，对于我来说，这似乎不太容易理解.其他可能性是:

However this seems less readable to me. Other possibilities are:

if (opt.filter(_ == "lakes").isDefined)

if (opt.find(_ == "lakes").isDefined) //uses implicit conversion to Iterable

但是我不认为这些意图能更好地表达意图:

But I don't think these clearly express the intent either which would be better as:

if (opt.isDefinedAnd(_ == "lakes"))

有人有更好的方法进行这项测试吗?

Has anyone got a better way of doing this test?

推荐答案

关于

if (opt == Some("lakes"))

这清楚地表达了意图，并且是直截了当的.

This expresses the intent clearly and is straight forward.

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