For the go language, a magical magic for customizing structure tags.

The case of the first letter in go determines whether this variable can be called externally,

For example, when you use the JSON encoding of a standard library to customize one's structure:

<pre style= "margin-top:0px; margin-bottom:0px; " ><span style= "font-weight:600; Color: #000080; " >package</span><span style= "color: #c0c0c0;" > </span>main

Import(

  "Encoding/json"

  "FMT"

)

TypeTstruct{

 namestring

 Ageint  

}

FuncMain (){

  varinfoT=t{"Fyxichen",   +}

 FMT. Println ("before code:", Info)

 B,_: =json. Marshal (Info)

 FMT. Println ("after encoding:",string(b))

}

The operating result is:

Before encoding: {Fyxichen 24}

After encoding: {"Age": $} Here the value of name is not encoded, because the first letter of the receive is lowercase and external cannot be called.

When we interact with JSON and external APIs, other programming languages do not use casing to control the scope of variables like go. So the use of the following label will be more comfortable.

Package Mainimport ("Encoding/json" "FMT") type T1 struct {name stringage  int}type T2 struct {name string ' JSON: ' Name ' ' Age  int    ' JSON: ' Age ' '}func main () {var info1 T1 = t1{"Fyxichen", 24}var info2 T2 = t2{"Fyxichen", 24}b, _: = json.m Arshal (INFO1) fmt. Println ("Struct1:", string (b)) B, _ = json. Marshal (Info2) fmt. Println ("Struct2:", string (b))}

Operation Result:

Struct1: {"Name": "Fyxichen", "Age": 24}

Struct2: {"name": "Fyxichen", "Age": 24}

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

For the go language, a magical magic for customizing structure tags.