reorganize: interfaces section

interfaces/02-receivers/main.go

@@ -9,19 +9,22 @@ package main
 
 func main() {
 	var (
-		// mobydick  = book{title: "moby dick", price: 10}
+		mobydick  = book{title: "moby dick", price: 10}
 		minecraft = game{title: "minecraft", price: 20}
 		tetris    = game{title: "tetris", price: 5}
 	)
 
-	var items []game
-	items = append(items, minecraft, tetris)
+	// sends a pointer of minecraft to the discount method
+	// same as: (&minecraft).discount(.1)
+	minecraft.discount(.1)
 
-	// you can attach methods to a compatible type on the fly:
-	my := list([]game{minecraft, tetris})
+	mobydick.print()
+	minecraft.print()
+	tetris.print()
 
-	// you can call methods even on a nil value
-	// my = nil
-
-	my.print() // or: list.print(items)
+	// creates a variable that occupies 200mb on memory
+	var h huge
+	for i := 0; i < 10; i++ {
+		h.addr()
+	}
 }