Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.4)
// Compass (v1.0.0.alpha.18)
// ----

//recursive map-has-key() function
@function rmhk($m, $a){
  @if type-of($m) == map {
    @if map-has-key($m, $a) { @return true; };
    @each $key,$e in $m {
      @if rmhk($e, $a) { @return true; }
    }
  }
  @return false;
}

$map: (
config: (
    foo: (
        a: 1,
        b: 2,
    ),
    bar: (
        a: 3,
        b: 4,
    ),
));

test {
  test1: type-of($map);
  test2: map-has-key($map, bar);
  test3: rmhk($map, bar);
}

SassMeister-output.css

test {
  test1: map;
  test2: false;
  test3: true;
}