Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.2)
// Compass (v1.0.0.alpha.17)
// ----

$border-default-size: 1px !default;
$border-default-pattern: solid !default;
$border-default-color: #000000 !default;

@function add-border(
    $border-size: $border-default-size, 
    $border-pattern: $border-default-pattern, 
    $border-color: $border-default-color) {
    	$border: $border-size $border-pattern $border-color;
    	@return $border;
    }

.border-test {
  border-right: add-border(); 
  border: add-border(2px, #bada55, dotted);
}

SassMeister-output.css

.border-test {
  border-right: 1px solid black;
  border: 2px #bada55 dotted;
}