The origin of delegation in programming is from object composition. Object composition is a way to combine simple objects to derive a complex one. Object compositions are a critical building block of many basic data structures, including the tagged union, the linked list, and the binary tree.
To make object composition more reusable (as reusable as inheritance), a new pattern is incorporated—the delegation pattern.
This pattern allows an object to have a helper object, and that helper object is called a delegate. This pattern allows the original object to handle requests by delegating to the delegate helper object.
Though delegation is an object-oriented design pattern, not all languages have implicit support for delegation (such as Java, which doesn't support delegation implicitly). In those cases, you can still use delegation by explicitly...
