scala-functional-idioms

name	scala-functional-idioms
description	Idiomatic functional programming in Scala using sealed traits, pattern matching, and Option/Either for robust error handling.

Key Patterns

• Sealed Hierarchies: Use sealed trait for domain models (e.g., ADTs) to enable exhaustiveness checking in pattern matching.
• Option/Either: Prefer Option[T] for missing values and Either[E, T] for operations that can fail, avoiding nulls and throwing exceptions.
• Expression-Oriented: Leverage Scala's expression-based style over imperative statements.
• Pattern Matching: Use match expressions for data decomposition and control flow.

Example

sealed trait Result
case class Success(value: String) extends Result
case class Failure(reason: String) extends Result

def process(input: Option[String]): Result = input match {
  case Some(s) if s.nonEmpty => Success(s.toUpperCase)
  case _ => Failure("Invalid input")
}