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update: interfaces

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Inanc Gumus
2019-08-19 20:01:02 +03:00
parent b39a9ea117
commit aa7fada2aa
9 changed files with 9 additions and 202 deletions
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35
interfaces/04-interfaces/main.go
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@ -1,35 +0,0 @@
// 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 (
minecraft = game{title: "minecraft", price: 20}
tetris = game{title: "tetris", price: 5}
mobydick = book{title: "moby dick", price: 10}
)
var my list
// my.list() // nil receiver is a valid value
// + 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()
}