IvanVergiliev · June 17, 2021 20:35
diff --git a/tree_transform_dry.scala b/tree_transform_dry.scala
 def transformTree(tree: Tree): Option[Tree] = {
  // Notice that there's no `canTranform` - we're using
  // `transform().isDefined` to check for transformability!
   val transformedLeft = if (transform(tree.left).isDefined) {
     transform(tree.left)
  } else None
  
  ...
 }
	def transformTree(tree: Tree): Option[Tree] = {
	// Notice that there's no `canTranform` - we're using
	// `transform().isDefined` to check for transformability!
	val transformedLeft = if (transform(tree.left).isDefined) {
	transform(tree.left)
	} else None

	...
	}