CODEWITHSUNDEEP
scala
Donbeo
Donbeo

Reputation: 17617

How to select the second smallest element from sorted list?

How can I select the second smallest element after that a list has been sorted?

With this code I get an error and I do not understand why.

object find_the_median {
  val L = List(2,4,1,2,5,6,7,2)

  L(2)
  L.sorted(2) // FIXME returns an error
}

Upvotes: 1

Views: 559

Answers (1)

miguel
miguel

Reputation: 714

It's because sorted receives implicitly an Ordering argument, and when you do it like L.sorted(2) the typechecker thinks you want to pass 2 as an Ordering. So one way to do it in one line is:

L.sorted.apply(2)

or to avoid the apply pass the ordering explicitly:

L.sorted(implicitly[Ordering[Int]])(2)

which I admit is somewhat confussing so I think the best one is in two lines:

val sorted = L.sorted
sorted(2)

(You may also want to adhere to the Scala convention of naming variables with lowercase).

Upvotes: 7

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