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When did people favor composition over inheritance?
The phrase “favor composition over inheritance” has become one of those thought-terminating cliches in software design, and I always like to take a deeper look at those to understand where they come from and what ideas we’re missing if we just take the phrase at face value without engaging with the discussion that led to it. This is one of those aphorisms with a definite origin story (compare with Aphorism Considered Harmful for an example where the parts have clear origins but the whole does not): it’s the second object-oriented design principle in the Design Patterns book from the “Gang of Four” Gamma, Helm, Johnson, and Vlissides.
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