Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.4)
// Compass (v1.0.0.alpha.18)
// ----

// Define items

$brand-bright: (
  name: bright,
  color: yellow
);

$brand-dark: (
  name: dark,
  color: black
);

// Create collection from items
$brands: (
  $brand-bright,
  $brand-dark,
);

// Variant Mixin

@mixin brand-variant ($name, $color) {
  .brand--#{$name} {
    h3 {
      color: $color;
    }
  } 
}

// Loop over items, passing the value map as the parameter
@each $item in $brands {
  @include brand-variant($item...);
}

SassMeister-output.css

.brand--bright h3 {
  color: yellow;
}

.brand--dark h3 {
  color: black;
}