function borderColor() {
    for (var _len = arguments.length, values = new Array(_len), _key = 0; _key < _len; _key++) {
      values[_key] = arguments[_key];
    }
    return directionalProperty.apply(void 0, ['borderColor'].concat(values));
  }
Shorthand that accepts up to four values, including null to skip a value, and maps them to their respective directions.
@example
// Styles as object usage
const styles = {
  ...borderColor('red', 'green', 'blue', 'yellow')
}

// styled-components usage
const div = styled.div`
  ${borderColor('red', 'green', 'blue', 'yellow')}
`

// CSS as JS Output

div {
  'borderTopColor': 'red',
  'borderRightColor': 'green',
  'borderBottomColor': 'blue',
  'borderLeftColor': 'yellow'
}