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32 lines
589 B
Text
32 lines
589 B
Text
module Triangle exposing (..)
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import Set
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type Triangle
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= Equilateral
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| Isosceles
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| Scalene
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version : Int
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version =
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2
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triangleKind : number -> number -> number -> Result String Triangle
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triangleKind x y z =
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if x <= 0 || y <= 0 || z <= 0 then
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Err "Invalid lengths"
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else if x + y <= z || x + z <= y || y + z <= x then
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Err "Violates inequality"
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else
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case Set.size (Set.fromList [ x, y, z ]) of
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1 ->
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Ok Equilateral
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2 ->
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Ok Isosceles
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_ ->
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Ok Scalene
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