foreach 和枚举 [英] foreach and Enumeration

问题描述

我正在尝试学习一些 Scala 阅读材料编程 Scala，作者 Dean Wampler.

I'm try to learn some Scala reading Programming Scala, by Dean Wampler.

我正在尝试复制一个关于 Enumeration 的代码片段

I'm trying to replicate a code snippet about Enumeration

object Breed extends Enumeration {
  val doberman = Value("Doberman Pinscher")
  val yorkie = Value("Yorkshire Terrier")
  val scottie = Value("Scottish Terrier")
  val dane = Value("Great Dane")
  val portie = Value("Portuguese Water Dog")
}

for (breed <- Breed) println(breed.id + "\t" + breed)

但是，在最后一行代码中，我收到了这个错误:

But, in the last line of code, I got this error:

value foreach is not a member of object Breed

我错过了什么吗?怎么解决?

Am I missing something? How can I solve?

推荐答案

你需要使用.values:

for (breed <- Breed.values) println(breed.id + "\t" + breed)

为什么不让它更像Scala-y

And why not make it a bit more scala-y

Breed.values.foreach(breed => println(breed.id + "\t" + breed));

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