CODEWITHSUNDEEP
arraysscala
Kuba Wenta
Kuba Wenta

Reputation: 600

Get length of array inside parameter list in Scala

I would like to use length of provided array inside parameters list. I tried

def find(xs: Array[Double], m:Int = xs.length*2) = ???

,but xs is not accessible for m parameter. Is it possible to do that? How?

Upvotes: 1

Views: 749

Answers (2)

Tim
Tim

Reputation: 27356

In this case an ugly alternative is to use an invalid length as the default:

def find(xs: Array[Double], _m: Int = -1) = {
  val m = if (_m >= 0) _m else xs.length

Upvotes: 0

Andrey Tyukin
Andrey Tyukin

Reputation: 44918

When defining default values of arguments, you can refer only to variables in the previous argument lists. Therefore, you need two argument lists:

def find(xs: Array[Double])(m: Int = xs.size * 2) = ???

Then you can call it as follows:

find(Array(1, 2, 3))(6)

and 

find(Array(1, 2, 3))()

Upvotes: 2

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