mixins with arguments

new_gist_file.sass

// regular arguments

@mixin customBorder ($width, $color, $style) {
  border: {
      width: $width;
      color: $color;
      style: $style;
  }
}

#mycontainer {
  @include customBorder (3px, blue, dashed);
}

// arguments with default

@mixin customBorder2 ($width: 1px, $color: red, $style: solid) {
  border: {
      width: $width;
      color: $color;
      style: $style;
  }
}

// use default values

#mycontainer {
  @include customBorder2;
}

// or pass new values

#mycontainer {
  @include customBorder2(3px, blue, dashed);
}

// arguments with defaults and parameters

@mixin customBorder3 ($width, $color: red, $style: solid) {
  border: {
      width: $width;
      color: $color;
      style: $style;
  }
}

// $width must always be defined
#mycontainer {
  @include customBorder3 (1px);
}

// or
// $width must always be defined and change blue to red

#mycontainer {
  @include customBorder3 (1px, red);
}

// or
// $width must always be defined and change blue to red and change line type

#mycontainer {
  @include customBorder3 (1px, red, dashed);
}