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# 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)
# WRITE THIS CODE
#--
a, b, c = [a, b, c].sort
fail TriangleError if (a+b) <= c
sides = [a, b, c].uniq
[nil, :equilateral, :isosceles, :scalene][sides.size]
#++
end
# Error class used in part 2. No need to change this code.
class TriangleError < StandardError
end
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