Lesson: 06 | String Utility

Notes

public class StringUtility {
    
    public static Integer StringToInteger(String intString) {
        try {
            return intString != null ? Integer.valueOf(intString) : 0;
        } catch (Exception e) {
            return 0;
        }
    }
    
    
    public static String formatNamesAsHtmlList(List<String> names) {
        String formattedList = '<b><ol style="color:green">';
        
        for (String name : names) {
            formattedList += '<li>' + name + '</li>';
        }
        
        formattedList += '</ol></b>';
        
        return formattedList;
    }
    
    public static  List<String> StringToCollection (String CollectionOfEmails){
        List<String> EmailList = new List<String>();
        if(String.isBlank(CollectionOfEmails)){
            return EmailList;
        }
        
        for (String email : CollectionOfEmails.split(';')) {
            EmailList.add(email.trim());
        }
        return EmailList;
    }
    
    public static String formatPhoneNumber(String phoneNumber) {
        if (String.isBlank(phoneNumber) || phoneNumber.length() != 10 || !phoneNumber.isNumeric()) {
            throw new IllegalArgumentException('Invalid phone number. Must be a 10-digit numeric string.');
        }
        
        String countryCode = '+1';
        String formatted = countryCode + ' ' +
            phoneNumber.substring(0, 3) + ' ' +
            phoneNumber.substring(3, 6) + ' ' +
            phoneNumber.substring(6, 8) + ' ' +
            phoneNumber.substring(8, 10);
        
        return formatted;
    }
    
    
}