Explain Iterator Syntax on Ruby on Rails

Question

I started learning Ruby on Rails and found myself confounded by the syntax, so I had to read about somet of the Ruby syntax. I learned the syntax from http://www.cs.auckland

Answer 1

 do ||
    
end

This creates a temporary anonymous function which accepts an item into a temporary variable, and then lets things operate on that item. The anonymous function is passed in to the original specified to operate on the items yielded by that function.