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[Note] Golang Snippets

go snippets @ Github

在 Terminal 產生問題,並取得使用者在 Terminal 輸入的內容#

keywords: bufio, fmt, log, os, strings#

add_person.go @ GitHub: protobuf

func main() {
// 建立 Reader
r := bufio.NewReader(os.Stdin)
// 詢問姓名
fmt.Println("What's your name?")
name, err := r.ReadString('\n')
if err != nil {
log.Fatalln(err)
}
name = strings.TrimSpace(name)
// 詢問年齡
fmt.Println("What's your age?")
age, err := r.ReadString('\n')
if err != nil {
log.Fatalln(err)
}
age = strings.TrimSpace(age)
// 輸出結果:Hello Aaron, you are 32 years old
fmt.Printf("Hello %s, you are %s years old", name, age)
}

enum#

enum with string value#

package mode#

// modified from: https://github.com/gotify/server/blob/master/mode/mode.go
package mode
type Mode string
var (
Dev Mode = "dev"
Prod Mode = "prod"
Test Mode = "test"
)
var mode = Dev // mode 預設值是 Dev
func Set(newMode Mode) {
mode = newMode
}
func Get() Mode {
return mode
}

main#

func main() {
// 取得預設的 mode
currentMode := mode.Get()
fmt.Println("currentMode", currentMode) // dev
// 使用 Set 更新 mode
mode.Set(mode.Prod)
updatedMode := mode.Get()
fmt.Println("updatedMode", updatedMode) // prod
// 轉成字串
modeString := string(updatedMode)
fmt.Println("modeString", modeString) // prod
}

enum with integer value#

enum @ pjchender github > go-snippets

package#

package enum
import "fmt"
type OrderStatus int
const (
Created OrderStatus = iota
Paid
Canceled
Shipped
)
var orderStatues = map[OrderStatus]string{
Created: "Created",
Paid: "Paid",
Canceled: "Canceled",
Shipped: "Shipped",
}
func (w OrderStatus) String() (string, error) {
text, ok := orderStatues[w]
if !ok {
return "", fmt.Errorf("no available enum of %v", w)
}
return text, nil
}
func (w OrderStatus) ToInt() int {
return int(s)
}

main#

func main() {
receiveData = 0
orderStatus, err := OrderStatus(receiveData).String()
fmt.Println(orderStatus) // "Created"
}
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