What's in Ruby class Array

In the last two or three years, I've written "What's Here" sections for about 20 Ruby core and standard library classes and modules.

Here's the one for class Array: https://docs.ruby-lang.org/en/master/Array.html#class-Array-label-What-27s+Here.

It's not a tutorial; it's an overview. It's meant to help readers become acquainted with the methods in the class.