Nodes for the term “idiom”

Using the Scala Option, Some, and None idiom (instead of Java null)

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Java best practice: Return a List, not a LinkedList

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Scala idiom: Prefer immutable code (immutable data structures)

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Scala FP idiom: Methods should not have side effects

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Initialize Scala variables with Option, None, and Some (not null)

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10 OOP principles Java developers should know

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