learngo/interfaces/10-stringer/main.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

import "fmt"

func main() {
	l := list{
		{title: "moby dick", price: 10, released: toTimestamp(118281600)},
		{title: "odyssey", price: 15, released: toTimestamp("733622400")},
		{title: "hobbit", price: 25},
	}

	l.discount(.5)

	// The list is a stringer.
	// The `fmt.Print` function can print the `l`
	// by calling `l`'s `String()` method.
	//
	// Underneath, `fmt.Print` uses a type switch to
	// detect whether a type is a Stringer:
	// https://golang.org/src/fmt/print.go#L627
	fmt.Print(l)

	// The money type is a stringer.
	// You don't need to call the String method when printing a value of it.
	// var pocket money = 10
	// fmt.Println("I have", pocket)
}