How to combine asymmetric lists the following way

Question

Possible Duplicate:
Scala - can yield be used multiple times with a for loop?
Cartesian product of two lists

I try to combine some Scala Lists the following way, but no success so far.

List (List ("abc", "def"), List ("gh", "ij", "kl"), List ("mnop") ...)

-> The result should be

List(
List("abc", "gh", "mnop"),
List("abc", "ij", "mnop"),
List("abc", "kl", "mnop"),
List("def", "gh", "mnop"),
List("def", "ij", "mnop"),
List("def", "kl", "mnop")
)

This is called a [cartesian product](http://en.wikipedia.org/wiki/Cartesian_product). There's an example of how to do it in Scala [in this answer](http://stackoverflow.com/a/8218167/98117). — hammar, Oct 31 '12 at 00:26

score 2 · Accepted Answer · answered Oct 31 '12 at 01:19

2

for {
  a <- List("abc","def")
  b <- List("gh", "ij", "kl")
  c <- List("mnop")
} yield List(a, b, c)

answered Oct 31 '12 at 01:19

Steve Waldman

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It's the right answer, I see no reason for down voting. – pedrofurla Oct 31 '12 at 04:08

How to combine asymmetric lists the following way

1 Answers1