Convert String to Lowercase and Uppercase in Golang

Application

Create new folder named src. In src folder, create new file named main.go as below:

package main

import (
	"fmt"
	"strings"
)

func main() {

	s1 := "abc"
	s1 = strings.ToUpper(s1)
	fmt.Println(s1)

	s2 := "DEF"
	s2 = strings.ToLower(s2)
	fmt.Println(s2)

}

Output

Open Terminal windows in Visual Studio Code and run command line: go run main.go

ABC
def