Original link: http://wwj718.github.io/post/%E7%BC%96%E7%A8%8B/traits-composable-units-of-behaviour/
What are Traits Traits are a concept used in object-oriented programming, it represents a set of methods used to extend the functionality of a class – wikipedia Trait Traits were originally invented in Smalltalk, and later many programming languages have implemented it: Rust Traits Scala Traits Fortress
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