How to check if a string is empty or consists only of whitespace in Golang?

In Golang, you can use the strings.TrimSpace() function to check if a string is empty or consists only of whitespace. Here is an example:

package main

import (
	"fmt"
	"strings"
)

func main() {
	str := "  " // Example string with whitespace

	if strings.TrimSpace(str) == "" {
		fmt.Println("String is empty or consists only of whitespace")
	} else {
		fmt.Println("String is not empty or does not consist only of whitespace")
	}
}

In this example, the strings.TrimSpace() function is used to remove any leading or trailing whitespace from the string str. Then, the resulting string is checked with an empty string using the == operator. If it matches, the string is considered empty or consisting only of whitespace.