simple loggers

main.go

+package main
+
+import (
+	"log"
+	"os"
+)
+
+func main() {
+
+	s := "Hello From Main"
+	log.Println(s)
+
+	//log print extra info like date time, filename etc and we can configure desire extra info
+	flags := log.Ldate | log.Lshortfile | log.Ltime
+	log.SetFlags(flags)
+	log.Println(s)
+
+	//can create multiple logger with prefix like INFO, WARN, ERROR
+	infoLogger := log.New(os.Stdout, "INFO : ", flags)
+	infoLogger.Println("Hi From Info Logger")
+
+	warnLogger := log.New(os.Stdout, "WARN : ", flags)
+	warnLogger.Println("Hi From Warn Logger")
+
+	errorLogger := log.New(os.Stdout, "ERROR : ", flags)
+	errorLogger.Println("Hi From Error Logger")
+
+}

packages/go.mod

-module example.com/packages
-
-go 1.20

packages/main.go

-package main
-
-import (
-	"fmt"
-
-	"example.com/packages/utils"
-)
-
-func main() {
-	s := "Hello From Main"
-	fmt.Println(utils.Temp)
-	fmt.Println(utils.GetStringLength(s))
-}

packages/utils/fun.go

-package utils
-
-var Temp string = "Testing"
-
-func GetStringLength(s string) int {
-	return len(s)
-}