Iterator Pattern:

The iterator pattern is a behavioral design pattern that allows sequential access to elements within a collection (like an array or slice) without exposing the underlying representation of that collection.

This pattern involves two components:
1. Aggregate:
This is the collection of objects that we wish to iterate over. It provides an interface for creating an iterator.

2. Iterator:
This is an interface that defines methods for accessing and traversing elements in the aggregate.

Imagine you have a box of chocolates with different flavors; this is your aggregate. The hand that goes in and selects each piece of chocolate, one by one, is your iterator. The hand doesn't need to know how the chocolates are arranged in the box; it simply needs to be able to reach in and pull out one chocolate at a time.

Implementation in Go:


In this example, the chocolates are printed one by one, with the iterator controlling the process of stepping through the aggregate of chocolates. The main function (client code) doesn't need to know how the chocolates are stored or accessed; it just needs the iterator.