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Scala

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In 2015 (March), I decided to learn Scala. Here I collect my notes. Since Scala is similar to Python in lots of aspects, I will give examples in both languages whenever possible.

Links

• http://www.scala-lang.org/ (HQ)
• http://www.scala-lang.org/api/ (ScalaDoc API reference)
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• http://stackoverflow.com/tags/scala/info (StackOverflow's info page on Scala)
• http://en.wikipedia.org/wiki/Scala_(programming_language) (overview of the language)
• Scala frameworks
• Tutorials

News / Newsletters

• http://www.reddit.com/r/scala
• http://scalatimes.com/ (Scala Times, since 2014)
• http://typesafe.com/newsletter

Best Practices / Style Guides

• Effective Scala from Twitter
• http://docs.scala-lang.org/style/ (Scala Style Guide)
• https://github.com/databricks/scala-style-guide

Collections

• The Scala 2.8 Collections API
• http://www.scala-lang.org/docu/files/collections-api/collections_40.html (different collection types have different performance characteristics)

Books

• Scala for the Impatient (Download the first 9 chapters from here. A very nice book with exercises at the end of each chapter.)

Knowledge Base

• alap.scala
• scala version, sbt version
• recommended IDE
• the REPL (with syntax highlighting)
• Java and Scala
• variables, basic types, rich types
• conversions (string → int, int → string, etc.)
• ASCII codes (int → char, char → int)
• BigInt (working with huge numbers)
• import (import from packages)
• math functions
• some string operations
• implicit class (take every n-th character of a string)
• if / else; Unit; block
• read from stdin
• string formatting
• for loop
• for comprehension
• functions, methods
• stringbuffer (more precisely: StringBuilder)
• working with files
• get the HTML source of a webpage
• ranges
• Array and ArrayBuffer
• sorting
• split / join
• Array goodies
• matrix
• Java → Scala, Scala → Java (interoperating)