76 lines
1.8 KiB
Go
76 lines
1.8 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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"encoding/json"
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"fmt"
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"log"
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)
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const data = `[
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{
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"title": "moby dick",
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"price": 10,
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"released": 118281600
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},
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{
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"title": "odyssey",
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"price": 15,
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"released": 733622400
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},
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{
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"title": "hobbit",
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"price": 25,
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"released": -62135596800
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}
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]`
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func main() {
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/* encoding */
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l := list{
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{Title: "moby dick", Price: 10, Released: toTimestamp(118281600)},
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{Title: "odyssey", Price: 15, Released: toTimestamp("733622400")},
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{Title: "hobbit", Price: 25},
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}
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data, err := json.MarshalIndent(l, "", " ")
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println(string(data))
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/* decoding */
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// var l list
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// if err := json.Unmarshal([]byte(data), &l); err != nil {
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// log.Fatal(err)
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// }
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// fmt.Print(l)
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}
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/*
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Summary:
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- json.Marshal() and json.MarshalIndent() can only encode primitive types.
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- Custom types can tell the encoder how to encode.
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- To do that satisfy the json.Marshaler interface.
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- json.Unmarshal() can only decode primitive types.
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- Custom types can tell the decoder how to decode.
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- To do that satisfy the json.Unmarshaler interface.
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- strconv.AppendInt() can append an int value to a []byte.
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- There are several other functions in the strconv package for other primitive types as well.
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- Do not make unnecessary string <-> []byte conversions.
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- log.Fatal() can print the given error message and terminate the program.
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- Use it only from the main(). Do not use it in other functions.
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- main() is should be the main driver of a program.
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*/
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