Generated by SassMeister.com.

SassMeister-input.scss

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

@mixin size($width, $height) {
    $widthpx: ();
    $heightpx: ();
    @each $i in $width {
        $widthpx: append($widthpx, $i + px);
    }
    @each $i in $height {
        $heightpx: append($heightpx, $i + px);
    }
    width: $widthpx;
    height: $heightpx;
}

.somestyle {
    @include size(10, 4);
}

SassMeister-output.css

.somestyle {
  width: 10px;
  height: 4px;
}