Let's talk about the usage scenarios of Go Type

This article is provided by the go language tutorial column to introduce you to the usage scenarios of Go Type. I hope it will be helpful to friends in need!

Go Type Usage Scenario

type Usage Scenario

1. Define the structure

// 定义商标结构
//将Brand定义为如下的结构体类型
type Brand struct {
}
// 为商标结构添加Show()方法
func (t Brand) Show() {
}

2. Make an alias

Before the Go 1.9 version, the code to define the built-in type was written like this:

type byte uint8
type rune int32

And after the Go 1.9 version it became:

type byte = uint8
type rune = int32

Distinguish between type aliases and type definitions

// 将NewInt定义为int类型
type NewInt int
// 将int取一个别名叫IntAlias
type IntAlias = int
func main() {
    // 将a声明为NewInt类型
    var a NewInt
    // 查看a的类型名
    fmt.Printf("a type: %T\n", a)
    // 将a2声明为IntAlias类型
    var a2 IntAlias
    // 查看a2的类型名
    fmt.Printf("a2 type: %T\n", a2)
}
a type: main.NewInt
a2 type: int

Batch definition structure

type (
    // A PrivateKeyConf is a private key config.
    PrivateKeyConf struct {
        Fingerprint string
        KeyFile     string
    }
    // A SignatureConf is a signature config.
    SignatureConf struct {
        Strict      bool          `json:",default=false"`
        Expiry      time.Duration `json:",default=1h"`
        PrivateKeys []PrivateKeyConf
    }
)

Single definition structure

type PrivateKeyConf struct {
    Fingerprint string
    KeyFile     string
}
type SignatureConf struct {
    Strict      bool          `json:",default=false"`
    Expiry      time.Duration `json:",default=1h"`
    PrivateKeys []PrivateKeyConf
}

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