Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.11)
// Compass (v1.0.3)
// ----

$sizes: (
  small: (
    height: 10px,
    width: 20px
  ),
  medium: (
    height: 30px,
    width: 40px
  ),
  large: (
    height: 50px,
    width: 60px
  )
);

@each $size, $dimensions in $sizes {
  .#{$size}-box {
    height: map-get($dimensions, height);
    width: map-get($dimensions, width);
  }
}

SassMeister-output.css

.small-box {
  height: 10px;
  width: 20px;
}

.medium-box {
  height: 30px;
  width: 40px;
}

.large-box {
  height: 50px;
  width: 60px;
}