// Convert shorthand to the 4-value syntax

@function unpack($shorthand) {
  @if length($shorthand) == 1 {
    @return nth($shorthand, 1) nth($shorthand, 1) nth($shorthand, 1) nth($shorthand, 1);
  }
  @else if length($shorthand) == 2 {
    @return nth($shorthand, 1) nth($shorthand, 2) nth($shorthand, 1) nth($shorthand, 2);
  }
  @else if length($shorthand) == 3 {
    @return nth($shorthand, 1) nth($shorthand, 2) nth($shorthand, 3) nth($shorthand, 2);
  }
  @else {
    @return $shorthand;
  }
}


@charset "UTF-8";

/// Converts shorthand to the 4-value syntax.
///
/// @param {List} $shorthand
///
/// @example scss - Usage
///   .element {
///     margin: unpack(1em 2em);
///   }
///
/// @example css - CSS Output
///   .element {
///     margin: 1em 2em 1em 2em;
///   }

@function unpack($shorthand) {
  @if length($shorthand) == 1 {
    @return nth($shorthand, 1) nth($shorthand, 1) nth($shorthand, 1) nth($shorthand, 1);
  } @else if length($shorthand) == 2 {
    @return nth($shorthand, 1) nth($shorthand, 2) nth($shorthand, 1) nth($shorthand, 2);
  } @else if length($shorthand) == 3 {
    @return nth($shorthand, 1) nth($shorthand, 2) nth($shorthand, 3) nth($shorthand, 2);
  } @else {
    @return $shorthand;
  }
}

Add SassDoc for unpack function
Add SassDoc for unpack function
