forwardable_presentation
forwardable_presentation
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forwardable_presentation
On Github MatthewRDodds / forwardable_presentation
Delegation in Ruby
The Forwardable Module
What is it?
The Forwardable module provides delegation of specified methods to a designated object, using the methods def_delegator and def_delegators.
-- Ruby Source
Example (Before & After)
What is the advantage of this?
Isolation of delegated object reference in code (DRY) Less verbosity, looks and feels cleanerWhat can you delegate to?
- Methods
- Objects
- Instance Variables
Delegation can make refactoring easier
Method can be moved and called the same way from the original class.
Summary
The Forwardable module offers some interesting ways to compose classes and sharing of responsibilities.
Credits
For subject information and examples:
http://vaidehijoshi.github.io/blog/2015/03/31/delegating-all-of-the-things-with-ruby-forwardable/
http://radar.oreilly.com/2014/02/delegation-patterns-in-ruby.html
For slidedeck structure: