Determining an Objective-C Class Type

// STRING TO NUMBER  

   NSNumberFormatter * f = [[NSNumberFormatter alloc] init];

    [f setNumberStyle:NSNumberFormatterDecimalStyle];

if ([[myDict valueForKey:@"faxSent"] isKindOfClass:[NSString class]])

    {

        NSString* hasFaxBeenSent = [myDict valueForKey:@"faxSent"];

        hasFaxBeenSentNumber = [f numberFromString:hasFaxBeenSent];

    }

    else if ([[myDict valueForKey:@"faxSent"] isKindOfClass:[NSNumber class]])

    {

        hasFaxBeenSentNumber = [myDict valueForKey:@"faxSent"];

    }

// NUMBER TO STRING

    if ([[myDict objectForKey:@"emailAddressExists"] isKindOfClass:[NSString class]])

    {

        emailAddressExists = [myDict objectForKey:@"emailAddressExists"];

        

    }

    else if ([[myDict objectForKey:@"emailAddressExists"] isKindOfClass:[NSNumber class]])

    {

        emailAddressExistsNumber = [myDict valueForKey:@"emailAddressExists"];

        emailAddressExists = [emailAddressExistsNumber stringValue];

    

    }