How to create an array of arrays in scala

Question

In Scala, I would like to create a TestNG DataProvider that converts all the elements of an enumeration into an Array of Arrays where each element in the outer array is an array containing one of the values of the enumeration.

This is my first attempt, but it returns a Set of Arrays.

@DataProvider(name = "profileIdProvider")
def provideProfiles() = {
  for (profile <- ProfileId.values) yield Array(profile)
}

What I need it to return is something like this:

Array(Array(value1), Array(value2))

Out of curiosity, why do you need arrays as opposed to Seq or List? The example that you linked to is Java-centric, but in Scala most of what you'd do on an array you can also do on a list. — Chris Shain
– Chris Shain, Commented Feb 16, 2012 at 21:13
Hi Chris. The TestNG framework requires a DataProvider method to return either an Object[][] or an Iterator<Object[]> — KevinS
– KevinS, Commented Feb 16, 2012 at 21:15

missingfaktor · Accepted Answer · 2012-02-16 21:17:22Z

4

@DataProvider(name = "profileIdProvider")
def provideProfiles() = {
  ProfileId.values.map(Array(_)).toArray
}

Not tested, but should work I think.

answered Feb 16, 2012 at 21:17

missingfaktor

92.3k62 gold badges290 silver badges370 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Chris Shain · Accepted Answer · 2012-02-16 21:20:49Z

2

Something like this should do (modified to use ProfileId.values of course):

def provideProfiles() = { 
    var returnVal = List[Array[Int]]()
    for (profile <- 1 to 5) returnVal :+= Array(profile)
    returnVal.toArray
}

Though I like @missingfaktor's answer more, of course.

answered Feb 16, 2012 at 21:20

Chris Shain

51.5k7 gold badges95 silver badges124 bronze badges

1 Comment

KevinS Over a year ago

Thanks Chris. Your solution works as well. If I needed to preserve ordering, this would be the way to go.

Collectives™ on Stack Overflow

How to create an array of arrays in scala

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related