Code cleanup..

replace multi if block with a switch statement
  clean up comments

triangle.go

@@ -1,14 +1,14 @@
-// Package triangle determines what kind of triangle three side lengths make.
+// Package triangle: Determine what kind of triangle three side lengths make.
 package triangle
 
 import "math"
 
 // An enumeration of triangle types
 const (
-	NaT Kind = iota
-	Equ
-	Iso
-	Sca
+	NaT Kind = iota // Not a triangle
+	Equ             // Equlateral
+	Iso             // Isometric
+	Sca             // Scalene
 
 	testVersion = 2
 )
@@ -18,31 +18,29 @@ type Kind int
 
 // KindFromSides determines whether the three side lengths given
 // constitute a triangle and if so, what type of triangle it is.
-func KindFromSides(a, b, c float64) Kind {
+func KindFromSides(a, b, c float64) (k Kind) {
 	// Return NaT when any side is zero, negative, infinite, or NaN.
 	for _, f := range []float64{a, b, c} {
 		if f <= 0 || f != f || math.IsInf(f, 0) {
 			return NaT
 		}
 	}
+	switch {
 	// Return NaT if the sides fail triangle inequality tests.
-	if a+b < c || b+c < a || a+c < b {
-		return NaT
+	case a+b < c || b+c < a || a+c < b:
+		k = NaT
+	case a == b && b == c: // 3 equal length sides (Equ)
+		k = Equ
+	case a == b || b == c || a == c: // 2 equal length sides (Iso)
+		k = Iso
+	case a != b || b != c || a != c: // No equal length sides (Sca)
+		k = Sca
 	}
-	if a == b && b == c {
-		return Equ
-	}
-	if a == b || b == c || a == c {
-		return Iso
-	}
-	if a != b || b != c || a != c {
-		return Sca
-	}
-	return NaT
+	return k
 }
 
-// Iteration 1 benkmark results:
+// Iteration 2 benkmark results:
 //
 // PASS
-// BenchmarkKind-12	 2000000	       643 ns/op
-// ok  	exercism/go/triangle	1.948s
+// BenchmarkKind-12	 2000000	       651 ns/op
+//