Scala中包含将元组转换为列表的任何方法吗? [英] Are there any methods included in Scala to convert tuples to lists?

问题描述

我的Tuple2为List[List[String]]，我希望能够将元组转换为列表，以便随后可以使用List.transpose().有什么办法吗?另外，尽管我一直是通用解决方案的粉丝，但我知道它是Pair.

I have a Tuple2 of List[List[String]] and I'd like to be able to convert the tuple to a list so that I can then use List.transpose(). Is there any way to do this? Also, I know it's a Pair, though I'm always a fan of generic solutions.

推荐答案

适用于任何元组(scala 2.8):

Works with any tuple (scala 2.8):

myTuple.productIterator.toList

Scala 2.7:

Scala 2.7:

(0 to (myTuple.productArity-1)).map(myTuple.productElement(_)).toList

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不知道如何维护常规Product或Tuple的类型信息，而对于Tuple2:

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Not sure how to maintain type info for a general Product or Tuple, but for Tuple2:

def tuple2ToList[T](t: (T,T)): List[T] = List(t._1, t._2)

您当然可以为所有元组(最多22个)定义类似的类型安全的转换.

You could, of course, define similar type-safe conversions for all the Tuples (up to 22).

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