Slice and a recursive map-get

gistfile1.sass

$test: (
  one: (
    two: (
      val: 'socks'
    )
  ),
  socks: (
    pants: (
      shoes: 'hats'
    )
  )
);

@function map-me($map, $keys) {

  $key: nth($keys, 1);

  @if length($keys) > 1 {

    @if map-has-key($map, $key) {
      $slice: slice($keys, 2);
      @return map-me(map-get($map, $key), $slice);
    }
    @else {
      @warn 'No key #{$key} in map';
      @return null;
    }

  }
  @else {
    $map: map-get($map, $key);
  }

  @return $map;
}

@function slice($list, $offset: 1, $length: length($list)) {

  $new: ();

  @if $offset > $length {
    @warn 'Offset #{$offset} is greater than length #{$length}';
    @return null;
  }

  @for $i from $offset through $length {
    $new: append($new, nth($list, $i));
  }

  @return $new;
}
//@debug slice(one two three);
@debug 'final answer is #{map-me($test, one two val)}';
@debug 'final answer is #{map-me($test, socks pants shoes)}';
@debug 'final answer is #{map-me($test, a b c)}';