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Exercise 4

Consider an application that manages a collection of living things, including plants and animals. Plants include trees and flowers, while animals include mammals and birds.

Which of the concepts discussed in this chapter most closely describes the features of the scenario described above?

Solution

The features of the application described above most closely relate to the concept of inheritance. In this application, plants and animals would inherit from a type that includes living things, trees and flowers would inherit from a plants type, and mammals and birds would inherit from the animals. A plant is a living thing, as is an animal. Likewise, trees and flowers are plants, while mammals and birds are animals.

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```ruby
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end