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Added Tree::map #14

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15 changes: 15 additions & 0 deletions ch03/src/main/scala/ca/vgorcinschi/chapter03_datastructures/trees/Tree.scala
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Expand Up @@ -14,6 +14,21 @@ sealed trait Tree[+A] {
* Exercise 3.27 Write a function depth that returns the maximum path length from the root of a tree to any leaf.
*/
def depth: Int

/**
* Exercise 3.28 Write a function `map`, analogous to the method of the same name on List, that modifies each element
* in a tree with a given function
* @param f
* the function that modifies a value
* @tparam B
* new type, after application of `f`
* @return
* a new Tree with all values of the old Tree mapped
*/
def map[B](f: A => B): Tree[B] = this match {
case Leaf(value) => Leaf(f(value))
case Branch(left, right) => Branch(left.map(f), right.map(f))
}
}
case class Leaf[A](value: A) extends Tree[A] {
override val size: Int = 1
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