code: function reorderBorderRadius(p1, p2, p3, p4){
    if(p4)
      return [p2, p1, p4, p3].join(' ');
    if(p3)
      return [p2, p1, p2, p3].join(' ');
    if(p2)
      return [p2, p1].join(' ');
    else
      return p1;
  }
docs: Reorders border radius values for opposite direction
  
  reorderBorderRadius(A, B, C, D) -> 'B A D C'
  reorderBorderRadius(A, B, C) -> 'B A B C'
  reorderBorderRadius(A, B) -> 'B A'
  reorderBorderRadius(A) -> 'A'
  
  @param {String} p1 First element
  @param {String} p2 (Optional) Second element
  @param {String} p3 (Optional) Third element
  @param {String} p4 (Optional) Fourth element
  @return {String} Result
  @api private