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Option, Either and Error Handling

Scala uses Option and Either for safe, expressive error handling without exceptions.

Option

def findUser(id: Int): Option[String] = {
  if (id == 1) Some("Alice") else None
}
val result = findUser(2).getOrElse("Unknown")

Either

def divide(a: Int, b: Int): Either[String, Int] = {
  if (b == 0) Left("Cannot divide by zero") else Right(a / b)
}
val output = divide(4, 2).fold(err => err, res => res.toString)

Use these to write robust, null-safe code.

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