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These concepts are orthogonal. I can use composition and inheritance to define an IS_A relationship and I can use them to define a HAS_A relationship. For exa

These concepts are orthogonal. I can use composition and inheritance to define an IS_A relationship and I can use them to define a HAS_A relationship. For example, in Kotlin: class A : B // IS_A via inheritance class A(b: B) { // HAS_A via composition class A(b: B) : B by b // IS_A via composition

eiffel31 9y ago
> class A(b: B) : B by b // IS_A via composition I couldn't find the "B by b" syntax from the Kotlin docs, can you tell me that this does ?
- hota_mazi 9y ago
  It's delegation. Look at page 96 of this PDF file: https://kotlinlang.org/docs/kotlin-docs.pdf https://kotlinlang.org/docs/kotlin-docs.pdf
  - eiffel31 9y ago
    Thank you, wish Java had this :'(