new tasks

Task/Classes/Go/classes-2.go

@@ -0,0 +1,26 @@
+import reflect
+
+type happinessTester interface {
+    happy() bool
+}
+
+type bottleOfWine struct {
+    USD   float64
+    empty bool
+}
+
+func (b *bottleOfWine) happy() bool {
+    return b.USD > 10 && !b.empty
+}
+
+func main() {
+    partySupplies := []happinessTester{
+        &picnicBasket{2, true},
+        &bottleOfWine{USD: 6},
+    }
+    for _, ps := range partySupplies {
+        fmt.Printf("%s: happy? %t\n",
+            reflect.Indirect(reflect.ValueOf(ps)).Type().Name(),
+            ps.happy())
+    }
+}