getBridgedRings() {
    let bridgedRings = Array();

    for (var i = 0; i < this.rings.length; i++) {
      if (this.rings[i].isBridged) {
        bridgedRings.push(this.rings[i]);
      }
    }

    return bridgedRings;
  }
Returns an array containing the bridged rings associated with this  molecule.

@returns {Ring[]} An array containing all bridged rings associated with this molecule.