1  package piscine
 2  
 3  func IsAlpha(s string) bool {
 4  	for _, r := range s {
 5  		if !((r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') || (r >= '0' && r <= '9')) {
 6  			return false
 7  		}
 8  	}
 9  	return true
10  }