triangle.rb

# Triangle Project Code.

# Triangle analyzes the lengths of the sides of a triangle
# (represented by a, b and c) and returns the type of triangle.
#
# It returns:
#   :equilateral  if all sides are equal
#   :isosceles    if exactly 2 sides are equal
#   :scalene      if no sides are equal
#
# The tests for this method can be found in
#   about_triangle_project.rb
# and
#   about_triangle_project_2.rb
#
def triangle(a, b, c)
	# sort asending order <
	x, y, z = [a,b,c].sort

	# Raise an exception if the supposed shorter or equal lengths are smaller than the longest side
	#  Note: This is not a triangle if this is not the case
	raise TriangleError if x + y <= z || x <= 0

	# 
	[:equilateral, :isosceles, :scalene].fetch([x,y,z].uniq.length - 1)
end

# Error class used in part 2.  No need to change this code.
class TriangleError < StandardError
end