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Golang struct

Struct

在Go语言中，对结构体进行&取地址操作时，视为对该类型进行一次 new 的实例化操作，取地址格式如下：

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type T struct{
    field int
}

p := &T{}
v := T{}
p = &v
---
// I much more like this, wtf is the `:`? It's esay to forget and hard to mention
var p = &T{}
var v = T{}
p = &p

Tag

which is supported by the golang's reflect

This will make a json marshal auto convert the UserName field into user_name

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type User struct {
    UserName string `json:"user_name"`
}

Reflect example

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var field, ok = reflect.TypeOf(User).Elem().FieldByName("UserName")
if !ok {
    panic("Field not found")
}
var json = field.Tag.Get("json")
println(json) //"user_name"