SASS interpolation, list, mixin, and @each

gistfile1.scss

// List
$box-shadow-properties: -webkit-box-shadow, -moz-box-shadow, box-shadow;

// Mixin waiting to be included
@mixin box-shadow-with-inset($box-shadow-params, $inset-params) {
  // Iterates over each element in the list
  @each $property in $box-shadow-properties {
    // Uses interpolation to have the compiler then list out the properties listed above
    #{$property}: $box-shadow-params, $inset-params; }
}

.logobar-inner {
  @include box-shadow-with-inset(0px 1px 3px rgba(0, 0, 0, 0.25), inset 0px -1px 0px rgba(0, 0, 0, 0.1));
}