implemented visitor pattern

behavioral/visitor/visitor.go

@@ -0,0 +1,40 @@
+package visitor
+
+import (
+	"fmt"
+)
+
+type Visitor interface {
+	VisitProductWithHighTask(ProductWithHighTax) float32
+	VisitProductWithLowTask(ProductWithLowTax) float32
+}
+
+type Visitable interface {
+	Accept(Visitor) float32
+}
+
+type TaxVisitor struct {}
+func (v TaxVisitor) VisitProductWithHighTask(p ProductWithHighTax) float32 {
+	fmt.Println("Visiting Product With High Tax ...")
+	return p.Price * 1.3
+}
+
+func (v TaxVisitor) VisitProductWithLowTask(p ProductWithLowTax) float32 {
+	fmt.Println("Visiting Product With Low Tax ...")
+	return p.Price * 1.1
+}
+
+
+type ProductWithHighTax struct {
+	Price float32
+}
+func (p ProductWithHighTax) Accept(v Visitor) float32 {
+	return v.VisitProductWithHighTask(p)
+}
+
+type ProductWithLowTax struct{
+	Price float32
+}
+func (p ProductWithLowTax) Accept(v Visitor) float32 {
+	return v.VisitProductWithLowTask(p)
+}