Generated by SassMeister.com.

SassMeister-input.scss

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

@function f-fold($func, $prev, $list, $args...) {
    @each $item in $list {
        $prev: call($func, $prev, $item, $args...);
    }
    @return $prev;
}

p {
    $colors: red green blue orange;
    colors: $colors;
    mixed-color: f-fold(mix, white, $colors, 50%);
}

SassMeister-output.css

p {
  colors: red green blue orange;
  mixed-color: #9f724f;
}