More than 30 built-in classes are predefined in the Ruby class hierarchy. Like many other OOP languages, Ruby does not allow multiple inheritance, but that does not necessarily make it any less powerful. Modern OO languages frequently follow the single inheritance model. Ruby does support modules and mixins, which are discussed in the next section. It also implements object IDs, as we just saw, which support the implementation of persistent, distributed, and relocatable objects.
Some points to cover are:
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