Spend the whole today at RailsGirls Melbourne. Met many great people and had fun. It's the first time I've done it and would recommend others to do it.

I was helping RailsGirls Next group and should say exercises were too difficult and boring as they require minimum coding and mostly mathematical logic.

Also got a funny card during ice-braker exercise

Below is my solution for the roman numerals exercise. Just like my observation earlier, I've spend most of the time thinking about logic for the solution.

```
# encoding: utf-8
DOZENS = {
10 => ['I', 'V', 'X'],
100 => ['X', 'L', 'C'],
1_000 => ['C', 'D', 'M'],
10_000 => ['M', "_", "+"]
}
def convert_single number, dozen
one, five, ten = DOZENS[dozen]
case number
when 1..3
one * number
when 4
one + five
when 5
five
when 6..8
five + (one * number)
when 9
one + ten
end
end
def roman(number)
number.to_s.chars.reverse.each_with_index.map do |char, index|
dozen = 10 ** (index + 1)
convert_single(char.to_i, dozen)
end.reverse.join('')
end
require "minitest/spec"
require "minitest/autorun"
describe "roman" do
it "converts the number 1 to the string I" do
roman(1).must_equal 'I'
end
it "converts the number 1234 to the string I" do
roman(1234).must_equal 'MCCXXXIV'
end
it "converts the number 4999 to the string I" do
roman(3999).must_equal 'MMMCMXCIX'
end
end
```