done commit

database/mysql.go

@@ -0,0 +1,11 @@
+package database
+
+var connection string
+
+func init() {
+	connection = "MySQL"
+}
+
+func GetDatabase() string {
+	return connection
+}

error.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+func Pembagian(nilai int, pembagi int) (int, error) {
+	if pembagi == 0 {
+		return 0, errors.New("Pembagian dengan NOL")
+	} else {
+		return nilai / pembagi, nil
+	}
+}
+
+func main() {
+	hasil, err := Pembagian(100, 2500)
+	if err == nil {
+		fmt.Println("Hasil ", hasil)
+	} else {
+		fmt.Println("Error ", err.Error())
+	}
+}

error_custom.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+)
+
+type validationErrr struct {
+	Message string
+}
+
+func (v *validationErrr) Error() string {
+	return v.Message
+}
+
+type notFoundError struct {
+	Message string
+}
+
+func (n *notFoundError) Error() string {
+	return n.Message
+}
+
+func SavedData(id string, data any) error {
+	if id == "" {
+		return &validationErrr{"valid error"}
+	}
+
+	if id != "didi" {
+		return &notFoundError{"not found"}
+	}
+
+	return nil
+}
+
+func main() {
+	err := SavedData("eko", nil)
+	if err != nil {
+		if validationErrr, ok := err.(*validationErrr); ok {
+			fmt.Println("valid error", validationErrr.Error())
+		} else if notFoundError, ok := err.(*notFoundError); ok {
+			fmt.Println("not found", notFoundError.Error())
+		} else {
+			fmt.Println("unknown", err.Error())
+		}
+	} else {
+		fmt.Println("susses")
+	}
+}

helper/helper.go

@@ -0,0 +1,19 @@
+package helper
+
+import "fmt"
+
+var version = "1.0.0"
+var Application = "golang"
+
+func sayGoodBye(name string) string {
+	return "goodbye " + name
+}
+
+func SayHello(name string) string {
+	return "Helo " + name
+}
+
+func helper() {
+	result := sayGoodBye("lesmana")
+	fmt.Println(result)
+}

import.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"belajar-golang-dasar/helper"
+	_ "belajar-golang-dasar/internal"
+	"fmt"
+)
+
+func main() {
+	result := helper.SayHello("Didi")
+	fmt.Println(result)
+
+}

init.go

@@ -0,0 +1,10 @@
+package main
+
+import (
+	"belajar-golang-dasar/database"
+	"fmt"
+)
+
+func main() {
+	fmt.Println(database.GetDatabase())
+}

internal/internal.go

@@ -0,0 +1,7 @@
+package internal
+
+import "fmt"
+
+func init() {
+	fmt.Println("ini internal")
+}