SCSS padding functions

@function padding-top($padding){
  @return nth($padding, 1);
}

@function padding-right($padding){
  @if length($padding) == 1 {
    @return nth($padding, 1);
  } @else {
    @return nth($padding, 2);
  }
}

@function padding-bottom($padding){
  @if length($padding) == 1 {
    @return $padding;
  } @elseif length($padding) == 2 {
    @return nth($padding, 1);
  } @else {
    @return nth($padding, 3);
  }
}

@function padding-left($padding){
  @if length($padding) == 1 {
    @return nth($padding, 1);
  } @elseif length($padding) == 2 or length($padding) == 3 {
    @return nth($padding, 2);
  } @else {
    @return nth($padding, 4);
  }
}