Scala best practices I wish someone'd told me about
summary
Arrays compare by reference so use sameElements not equals; always annotate public return types to avoid ABI breaks; avoid Enumeration — use sealed trait ADTs with final case classes; custom extractors and structural types cause unsafe pattern-match and runtime reflection, prefer type classes; encode errors with Option/Either/Try (or make error types extend Exception for Java interop); don't use non-local return or implicit conversions; run scalafix/scapegoat/wartremover and upgrade to Scala 3 where many issues are fixed.
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chapters (17)
- 0:00Intro
- 1:39Array comparison
- 3:44Type annotation
- 5:30Unicode operators
- 7:19Enumerations
- 10:22Sealed traits
- 12:19Algebraic Data Types
- 15:45Case classes
- 18:40Custom extractors
- 20:55Structural types
- 24:04Exceptions
- 31:38The return keyword
- 33:57Implicit conversions
- 36:31Implicit resolution
- 39:47String concatenation
- 42:04Enforcing best practices
- 43:26More good and bad practices
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