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[Sync Iteration] elixir/triangle/2 #27

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[Sync Iteration] elixir/triangle/2 #27

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19 changes: 19 additions & 0 deletions solutions/elixir/triangle/2/lib/triangle.ex
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Original file line number Diff line number Diff line change
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defmodule Triangle do
@type kind :: :equilateral | :isosceles | :scalene

@doc """
Return the kind of triangle of a triangle with 'a', 'b' and 'c' as lengths.
"""
@spec kind(number, number, number) :: {:ok, kind} | {:error, String.t()}
def kind(a, b, c) when a <= 0 or b <= 0 or c <= 0,
do: {:error, "all side lengths must be positive"}

def kind(a, b, c) when a + b < c or b + c < a or c + a < b,
do: {:error, "side lengths violate triangle inequality"}

def kind(a, a, a), do: {:ok, :equilateral}
def kind(a, a, _), do: {:ok, :isosceles}
def kind(a, _, a), do: {:ok, :isosceles}
def kind(_, a, a), do: {:ok, :isosceles}
def kind(_, _, _), do: {:ok, :scalene}
end