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scala3 feature examples - tree as typed enums / published by https://github.com/dacr/code-examples-manager #84bba0cf-f501-4e42-80bd-6d05ebe1e8f8/f6888d79804ba5b79a7ee0baf04a46737af84fb1
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| // summary : scala3 feature examples - tree as typed enums | |
| // keywords : scala3, tutorial, @testable | |
| // publish : gist | |
| // authors : David Crosson | |
| // license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
| // id : 84bba0cf-f501-4e42-80bd-6d05ebe1e8f8 | |
| // created-on : 2021-03-23T17:18:13+01:00 | |
| // managed-by : https://github.com/dacr/code-examples-manager | |
| // run-with : scala-cli $file | |
| //> using scala "3.4.2" | |
| enum Tree[T]: | |
| case Node(children: List[Tree[T]]) | |
| case Leaf(content: T) | |
| def map[U](f: T => U): Tree[U] = | |
| def convert(tree: Tree[T]): Tree[U] = | |
| tree match | |
| case Leaf(content) => Leaf(f(content)) | |
| case Node(children) => Node(children.map(convert)) | |
| convert(this) | |
| @main def run():Unit = | |
| import Tree.{Node,Leaf} | |
| val tree = Node(Node(Leaf(1)::Leaf(2)::Nil)::Leaf(3)::Nil) | |
| println(tree) |
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