Golang React JS Technology Blog

How to check UPPERCASE characters in a string in Golang?

Checking if all characters of a string are Uppercase evaluates to True or False. For example, checking if the string "TEST" is uppercase evaluates to True.

Use strings.ToUpper(s) to check are characters are in uppercase 
package main

import (
	"fmt"
	"strings"
)

func main() {
	s := "UPPERCASE"
	fmt.Println(strings.ToUpper(s) == s) // true

	s = "CAN'T"
	fmt.Println(strings.ToUpper(s) == s) // true
}
Use unicode.IsUpper(s) to verify all characters are in uppercase 
package main

import (
	"fmt"
	"unicode"
)

func IsUpper(s string) bool {
	for _, r := range s {
		if !unicode.IsUpper(r) && unicode.IsLetter(r) {
			return false
		}
	}
	return true
}

func main() {
	fmt.Println(IsUpper("UPPERCASE")) // true
	fmt.Println(IsUpper("CAN'T"))     // true
}
Most Helpful This Week
Golang Get current Date and Time in EST, UTC and MST? How to import structs from another package in Go? Get Set and Clear Session in Golang How to trim leading and trailing white spaces of a string in Golang? How to use wildcard or a variable in our URL for complex routing? How to delete or remove element from a Map?