Stop processing maps in Scala

Question

In the following code, I need to stop processing the map if the element = 2:

val seq = Seq(1,2,3)

seq.map { x => if (x==2) /* stop processing the map */  }
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Answer 1

You can't do it with map() directly as map() is designed to work over the entire collection, but you can split the collection into 2 parts and apply the map() to one and not the other.

val seq = Seq(0,1,2,3,3,2,1,0)
val (before, after) = seq.span(_ != 2)
before.map(_ + 70) ++ after  //res0: Seq[Int] = List(70, 71, 2, 3, 3, 2, 1, 0)