Ruby Koan 151 raising exceptions

Question

I\'m going through the ruby koans, I\'m on 151 and I just hit a brick wall.

Here is the koan:

# You need to write the triangle method in the file \'trian         


        

Answer 1

Here's my solution... honestly I can't think of a more concise and readable one!

def triangle(a, b, c)
  raise TriangleError unless a > 0 && b > 0 && c > 0
  raise TriangleError if a == b && a + b <= c
  raise TriangleError if a == c && a + c <= b
  return :equilateral if a == b && b == c
  return :isosceles   if a == b || b == c || c == a
  :scalene
end