Traits is an abstract type, used as a "simple conceptual model for structuring object oriented programs."[1]. Traits are similar to mixins, but may include definitions for class methods. Traits has been proposed for inclusion in Smalltalk, ActionScript 3.0, and are found in Perl 6 and Scala. Module mixins in Ruby are similar to traits to some degree.
Traits were initially developed at the Software Composition Group, University of Berne.
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