Nice writeup.

I noticed that catch and throw was missing.

def using_throw arr

  arr.each do |i|
    throw :early if i > 5
    puts arr[i]
  end

end

catch :early do
  using_throw [1, 2, 3, 4, 5, 6, 7, 8]
end

Demonstrates that the catch does not need to be in the same method.

def using_throw arr

  catch :early do
    arr.each do |i|
      throw :early if i > 5
      puts arr[i]
    end
  end

end

using_throw [1, 2, 3, 4, 5, 6, 7, 8]

If we want to catch in the method itself.