Blast From the Past

A brief history of Scala

It may be helpful to look back on how Scala has changed and improved over the last few major releases.

Scala 2.9

Scala 2.9 introduced some new features, including:

• Parallel Collections: Every collection can be converted into a corresponding parallel collection using the par method.
• App Trait: App replaces Application as a better way to write a top-level application class (args is available).
• DelayedInit Trait: If a class or object inherits from this trait, all its initialization code is packed in a closure and forwarded as an argument to a method named delayedInit, which is defined as an abstract method in trait DelayedInit.
• Repl Improvements: More robust cursor handling, bash-style ctrl-R history search, and new commands like :imports, :implicits, and :keybindings.
• Scala Runner: scala can accept a jar file, class name, or source file as an argument.
• Java Interop:
  • The

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