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List Ops
Implement basic list operations.
In functional languages list operations like length, map, and
reduce are very common. Implement a series of basic list operations,
without using existing functions.
Hints
The tests for this exercise require you to use extensions, a mechanism for adding new functionality to an existing class whose source you do not directly control without having to subclass it. To learn more about Kotlin's implementations of extensions, check out the official documentation.
The customFoldLeft and customFoldRight methods are "fold" functions, which is a concept well-known in the functional programming world, but less so in the object-oriented one. If you'd like more background information, check out this fold page.
Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.