Scala idioms ref

Skill cxcscmu/SkillLearnBench/skills/b4-skill-creator-gemini-3.1-flash-lite-preview/python-scala-translation/scala-idioms-ref

[COLM'26] SkillLearnBench is the first benchmark for evaluating continual learning methods that automatically generate agent skills.From the repository description

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npx -y skills add cxcscmu/SkillLearnBench --skill scala-idioms-ref

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SKILL.md

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name: scala-idioms-ref description: Idiomatic Scala patterns for common Python idioms. Use this to translate Pythonic code into idiomatic Scala 2.13. Covers case classes, Option/Either, pattern matching, collections, and higher-order functions.

Idiomatic Translations (Python -> Scala)

1. Data Structures

Python: @dataclass(frozen=True) -> Scala: case class Token(value: String, tokenType: TokenType, metadata: Map[String, Any] = Map.empty)
Python: Union[str, int] -> Scala: sealed trait ValueType; case class StringVal(v: String) extends ValueType; ... (ADT)
Python: list[T] -> Scala: List[T] or Seq[T] (immutable)

2. Control Flow

Python: if x is None: ... -> Scala: x match { case None => ... } or x.fold(...)
Python: for v in values: yield v -> Scala: values.iterator

3. Error Handling

Python: try...except / raise -> Scala: Try { ... } or Either[Error, Result]

4. Functional Programming

Python: Callable[[T], R] -> Scala: T => R
Python: list comprehension -> Scala: list.map(f) or for { x <- list } yield f(x)

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