问题
Last year I had quite a bit of experience with standard ML, but I haven't done any real functional programming in about 10 months. Now that I'm on the Scala bandwagon, I'm having trouble finding an operation which I used extensively in standard ML when writing a compiler (although to be fair, this method may not have been a library method).
Basically, I have two lists:
List("a","b","c")
List(1,2,3)
And I want an operation that will give me a list of tuples like this:
List(("a",1), ("b",2), ("c",3))
Is there a standard Scala function I can use to get this result? (I think we called it a zip function in standard ML, but that seems to refer to something different when I was searching for Scala zip functions.)
回答1:
You're right you can use zip:
val a = List("a","b","c")
// a: List[String] = List(a, b, c)
val b = List(1,2,3)
// b: List[Int] = List(1, 2, 3)
a zip b // beautified a.zip(b)
//res0: List[(String, Int)] = List((a,1), (b,2), (c,3))
来源：https://stackoverflow.com/questions/16423398/scala-two-lists-to-tuple-list