main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
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)
}
/*
Summary:
- fmt.Stringer has one method: String()
- That returns a string.
- It is better to be an fmt.Stringer instead of printing directly.
- Implement the String() on a type and the type can represent itself as a string.
- Bonus: The functions in the fmt package can print your type.
- They use type assertion to detect if a type implements a String() method.
- strings.Builder can efficiently combine multiple string values.
*/
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