Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

// Filter items from a list. Each function takes an item (and additional
// arguments) and returns a boolean value indicating whether the item passed the
// filter.
@function f-filter($func, $list, $args...) {
    $new-list: ();
    @each $item in $list {
        @if call($func, $item, $args...) {
            $new-list: append($new-list, $item);
        }
    }
    @return $new-list;
}

@function is-angular-unit($x) {
    @return not not index(deg rad grad turn, unit($x));
}

p {
    is-degrees-angular: is-angular-unit(3deg);
    is-ems-angular: is-angular-unit(24em);

    // And a functional filter.
    angular-values: f-filter(is-angular-unit, (1px 24em 3deg 64grad 7 2.5turn));
}

SassMeister-output.css

p {
  is-degrees-angular: true;
  is-ems-angular: false;
  angular-values: 3deg 64grad 2.5turn;
}