62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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// For more tutorials : https://learngoprogramming.com
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// In-person training : https://www.linkedin.com/in/inancgumus/
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// Follow me on twitter: https://twitter.com/inancgumus
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package main
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import (
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"fmt"
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"strconv"
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"time"
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)
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type book struct {
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// embed the product type into the book type.
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// all the fields and methods of the product will be
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// available in this book type.
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product
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published interface{}
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}
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// book type's print method takes priority.
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//
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// + when you call it on a book value, the following method will
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// be executed.
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//
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// + if it wasn't here, the product type's print method would
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// have been executed.
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func (b *book) print() {
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// the book can also call the embedded product's print method
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// if it wants to, as in here:
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b.product.print()
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p := format(b.published)
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fmt.Printf("\t - (%v)\n", p)
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}
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func format(v interface{}) string {
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var t int
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switch v := v.(type) {
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case int:
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// book{title: "moby dick", price: 10, published: 118281600},
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t = v
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case string:
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// book{title: "odyssey", price: 15, published: "733622400"},
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t, _ = strconv.Atoi(v)
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default:
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// book{title: "hobbit", price: 25},
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return "unknown"
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}
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// Mon Jan 2 15:04:05 -0700 MST 2006
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const layout = "2006/01"
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u := time.Unix(int64(t), 0)
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return u.Format(layout)
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}
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