53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
|
// For more tutorials: https://blog.learngoprogramming.com
|
||
|
|
//
|
||
|
|
// Copyright © 2018 Inanc Gumus
|
||
|
|
// Learn Go Programming Course
|
||
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||
|
|
//
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
var (
|
||
|
|
mobydick = book{title: "moby dick", price: 10}
|
||
|
|
minecraft = game{title: "minecraft", price: 20}
|
||
|
|
tetris = game{title: "tetris", price: 5}
|
||
|
|
rubik = puzzle{title: "rubik's cube", price: 5}
|
||
|
|
)
|
||
|
|
|
||
|
|
var store list
|
||
|
|
|
||
|
|
store = append(store, &minecraft, &tetris, mobydick, rubik)
|
||
|
|
|
||
|
|
tetris.discount(.8)
|
||
|
|
// printer(tetris).discount(.8)
|
||
|
|
|
||
|
|
store.print()
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
var my list
|
||
|
|
|
||
|
|
// + only the `*game` have methods.
|
||
|
|
// + `game` doesn't have any methods.
|
||
|
|
// + `item` interface couldn't be satisfied with a `game` value.
|
||
|
|
// + it can only be satisfied with a `*game` value.
|
||
|
|
// my = my.add(minecraft)
|
||
|
|
my = append(my, &minecraft)
|
||
|
|
my = append(my, &tetris)
|
||
|
|
my = append(my, &mobydick)
|
||
|
|
|
||
|
|
// interface value stores a pointer to minecraft
|
||
|
|
minecraft.discount(.5)
|
||
|
|
my.list()
|
||
|
|
|
||
|
|
my.discount(.5)
|
||
|
|
my.list()
|
||
|
|
*/
|
||
|
|
|
||
|
|
// ! cannot add mobydick to the store: it's a book type, not a game type.
|
||
|
|
// interfaces to the rescue!
|
||
|
|
// mobydick := book{title: "moby dick", price: 10}
|
||
|
|
// my.add(&mobydick)
|
||
|
|
// ----------------------------------------------------------------
|