book.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"
"strconv"
"time"
)
type book struct {
title string
price money
published interface{}
}
func (b book) print() {
p := format(b.published)
fmt.Printf("%-15s: %s - (%v)\n", b.title, b.price.string(), p)
}
func format(v interface{}) string {
var t int
switch v := v.(type) {
case int:
// book{title: "moby dick", price: 10, published: 118281600},
t = v
case string:
// book{title: "odyssey", price: 15, published: "733622400"},
t, _ = strconv.Atoi(v)
default:
// book{title: "hobbit", price: 25},
return "unknown"
}
// Mon Jan 2 15:04:05 -0700 MST 2006
const layout = "2006/01"
u := time.Unix(int64(t), 0)
return u.Format(layout)
}
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