What is an easy way in Golang to check if all characters in a string are upper case or lower case?
Also, how to handle a case where the string has punctuation?
See these examples:
package main
import (
"fmt"
"unicode"
)
func main() {
s := "UPPERCASE"
fmt.Println(s.IsUpper()) // Should print true
s = "lowercase"
fmt.Println(s.IsUpper()) // Should print false
s = "lowercase"
fmt.Println(s.IsLower()) // Should print true
s = "I'M YELLING AT YOU!"
fmt.Println(s.IsUpper()) // Should print true
}
Note: s.IsUpper() and s.IsLower() doesn't really exist, but would be nice to find an equivalent.
You can of course compare the upper and lower cased strings in their entirety, or you can short-circuit the comparisons on the first failure, which would be more efficient when comparing long strings.
func IsUpper(s string) bool {
for _, r := range s {
if !unicode.IsUpper(r) && unicode.IsLetter(r) {
return false
}
}
return true
}
func IsLower(s string) bool {
for _, r := range s {
if !unicode.IsLower(r) && unicode.IsLetter(r) {
return false
}
}
return true
}