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SassMeister-input.scss

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

// 'map', 'transform', 'select', or 'project' function. Iterate over a list,
// performing a function on each item, and collecting the new items. Each
// function takes an item as a first argument and returns a transformed item.
// You can pass additional arguments to the function too, which is a decent poor
// man's function composition.
// (I didn't call this f-map because the term 'map' is already used in Sass to
// denote a hash or dictionary.)
@function f-apply($func, $list, $args...) {
    $new-list: ();
    @each $item in $list {
        $new-list: append($new-list, call($func, $item, $args...));
    }
    @return $new-list;
}
 
@function square($x) {
    @return $x * $x;
}

p {
    // using the plain ol' square function
    square: square(3);
    // now let's lift it to work on lists using a higher-order function
    squares: f-apply(square, (1 2 3 4 5 6 7));
}

SassMeister-output.css

p {
  square: 9;
  squares: 1 4 9 16 25 36 49;
}