Monday, 30 November 2015

Composing with roles

A role does several things (a bit of hand-waving here):
  • It might provide behaviour (methods)
  • It might require behaviour (acting sort of like an interface)
  • Any conflicts (duplicate methods) must be resolved at compile-time

Understanding of roles and their use in specialisation by composition, can be aided enormously by Sandi Metz's talk, "Nothing is Something" (link).

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