wip - ratios 2

tests/bench/fixtures/ratios.go

@@ -0,0 +1,51 @@
+package fixtures
+
+import "fmt"
+
+type ratio [2]float64
+
+func newRatio(i, j float64) (ratio, error) {
+	if i == 0 || j == 0 {
+		return ratio{}, fmt.Errorf("ratio can't contain zero")
+	}
+	return ratio{i, j}, nil
+}
+
+func (r ratio) Decimal() float64 {
+	return r[0] / r[1]
+}
+
+// Equal r == r2
+func (r ratio) Equal(r2 ratio) bool {
+	return r.Decimal() == r2.Decimal()
+}
+
+// Less r < r2
+func (r ratio) Less(r2 ratio) bool {
+	return r.Decimal() < r2.Decimal()
+}
+
+// Greater r > r2
+func (r ratio) Greater(r2 ratio) bool {
+	return r.Decimal() > r2.Decimal()
+}
+
+// A returns A side of the A:B ratio
+func (r ratio) A() float64 { return r[0] }
+
+// B returns B side of the A:B ratio
+func (r ratio) B() float64 { return r[1] }
+
+func (r ratio) Invert() ratio {
+	r2, _ := newRatio(r[1], r[0])
+	return r2
+}
+
+// Noramlize will return a new ratio with both
+// sides of the ratio mulitplied by a constant.
+//
+// eg: ratio(1:1).Normalize(8) => ratio(8:8)
+func (r ratio) Normalize(c float64) ratio {
+	r2, _ := newRatio(r[0]*c, r[1]*c)
+	return r2
+}