Red > Green > Refactor > Red

cycle is based on desire

delegate

Draft article

what is

GoF Delegation

www.saturnflyer.com

non-free article

Using prototypical objects to implement shared behavior in object-oriented systems

free article

http://web.media.mit.edu/~lieber/Lieberary/OOP/Delegation/Delegation.html

SO answer

stackoverflow.com

etc

blog.jnito.com

when to use

blog.shinetech.com