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SOLID Principles in Scala - describe with examples

General/Othereasy0.2 min read

Reviewed by Aditya Kumar · Last reviewed 2026-03-24

S: Single Responsibility—one reason to change. O: Open/Closed—extend via traits. L: Liskov—subtypes substitutable. I: Interface Segregation—small traits. D: Dependency Inversion—depend on abstractions. Example: trait DataSource { def read(): DataFrame }; class S3Source extends...

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S: Single Responsibility—one reason to change. O: Open/Closed—extend via traits. L: Liskov—subtypes substitutable. I: Interface Segregation—small traits. D: Dependency Inversion—depend on abstractions. Example: trait DataSource { def read(): DataFrame }; class S3Source extends DataSource; class Pipeline(ds: DataSource). WHY: Maintainability, testability. Prefer composition; use implicits sparingly.

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Pro Tip

Red Flag: Definitions without code. Pro-Move: 'Our ETL uses DataSource trait; swap S3/Kafka without changing Pipeline; DIP enables testing with mocks.'

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