Internship← Scala Programming learning pathScala Programming · Module 7 of 10
Option, Either and error handling
Scala models missing values and errors as types.
📖 Key ideas
- Option[A] is Some(value) or None, replacing null.
- getOrElse gives a default for None.
- Either[Error, Value] is Left(error) or Right(value).
- Try catches exceptions as Success or Failure.
- for-comprehensions chain Options or Eithers cleanly.
💡 Real-life example: Like a parcel box that is clearly labelled "empty" or "has item": you never open it and find a surprise null.
OptionSome(value) or None
EitherLeft(error) or Right(value)
TrySuccess or Failure from code that may throw
getOrElseDefault when empty