code: function recurseChildOptions(obj, level){
              var child = '',
                  len = Object.keys(obj).length,
                  ctr = 0,
                  prefix;
              level = level || 1;
              for(var prop in obj) {
                  if(obj.hasOwnProperty(prop)){
                      var tab = getTabs(level +1, true),
                          val;
                      prefix = ctr > 0 ? ',\n' : '';
                      if(_.isPlainObject(obj[prop])){
                          if(!_.isEmpty(obj[prop])){
                              var subChild = recurseChildOptions(obj[prop], level + 1);
                              if(subChild && subChild.length)
                                  child += (tab + prop + ': { \n' + subChild + '\n' + tab + '}');
                          }
                      } else {
                          if(_.isArray(obj[prop])){
                              val = arrayToString(obj[prop]);
                              if(val){
                                  tab = ctr === 0 ? getTabs(level) : getTabs(level +1, true);
                                  child += (prefix + tab + prop + ': ' + arrayToString(obj[prop]));
                              }
                          } else {
                              var isFunc;
                              val = obj[prop];
                              isFunc = _.isFunction(val);
                              if(_.isString(val)){
                                  val = "'" + val.toString() + "'";
                              } else {
                                  val = val.toString();
                                  if(isFunc)
                                      val = funcToString(val, level);
                              }
                              child += (prefix + tab + prop + ': ' + val);
                          }
                      }
                      ctr +=1;
                  }
              }
              return child;
          }
docs: Recurse child options concat to string.
  @private
  @memberof Compare
  @param {object} obj - the child object.
  @returns {string}