list Scala 中是否包含任何将元组转换为列表的方法？
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Are there any methods included in Scala to convert tuples to lists?
提问by pr1001
I have a Tuple2of 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.
我有一个Tuple2，List[List[String]]我希望能够将元组转换为列表，以便我可以使用List.transpose(). 有没有办法做到这一点？此外，我知道这是一个Pair，尽管我一直是通用解决方案的粉丝。
回答by Mitch Blevins
Works with any tuple (scala 2.8):
适用于任何元组（scala 2.8）：
myTuple.productIterator.toList
Scala 2.7:
斯卡拉 2.7：
(0 to (myTuple.productArity-1)).map(myTuple.productElement(_)).toList
Not sure how to maintain type info for a general Product or Tuple, but for Tuple2:
不确定如何维护一般产品或元组的类型信息，但对于 Tuple2：
def tuple2ToList[T](t: (T,T)): List[T] = List(t._1, t._2)
You could, of course, define similar type-safe conversions for all the Tuples (up to 22).
当然，您可以为所有元组（最多 22 个）定义类似的类型安全转换。
回答by Michael T
Using Shapeless -
使用无形 -
@ import syntax.std.tuple._
import syntax.std.tuple._
@ (1,2,3).toList
res21: List[Int] = List(1, 2, 3)
@ (1,2,3,4,3,3,3,3,3,3,3).toList
res22: List[Int] = List(1, 2, 3, 4, 3, 3, 3, 3, 3, 3, 3)
Note that type information is not lost using Shapeless's toList.
请注意，使用 Shapeless 的toList.
