Cleaning up anonymous function expressions w/underscore

original.js

exports.index = function(req, res) {
  async.waterfall([
    //
    // validate the search string
    //
    function(cb) {
      // paramValidate protocol :
      // url, sort ording, sorting field, searching field, valid attributes and callback
      util.paramValidate(req.url, 'desc', 'id', Models.City.attributes, function (err, params) {
        cb(err, params);
      });
    },
    //
    // getting total row count by query values
    //
    function(params, cb) {
      // sqlCount protocol :
      // url, sort ording, sorting field, searching field, valid attributes and callback
      util.sqlCount(params, 'Cities', Models.City, validFields, 2, {},
      function(err, count) {
        cb(err, params, count);
      });
    },
    //
    // seeking all the row(s) by query values
    //
    function(params, count, cb) {
      if (count > 0) {
        // sqlSelect protocol :
        // url, sort ording, sorting field, searching field, valid attributes and callback
        util.sqlSelect(params, 'Cities', Models.City, validFields, 2, {}, undefined,
        function(err, result) {
          cb(err, {
            "params": params,
            "total_rows":count,
            "data": _.map(result, function(item){ return item.selectedValues; })
          });
        });
      } else cb(null,  {"params": params, "total_rows":count, "data" : []});
    }
  ],
  //
  // final return
  //
  function(err, result) {
    if (err) {
      res.send(err.status, err.msg);

    } else {
      res.send(200, result);
    }
  });
};

promised.js

util.paramValidate(req.url, 'desc', 'id', Models.City.attributes).then(function(params) {
    return util.sqlCount(params, 'Cities', Models.City, validFields, 2, {}).then(function(count) {
        if (count > 0) {
            // sqlSelect protocol :
            // url, sort ording, sorting field, searching field, valid attributes and callback
            return util.sqlSelect(params, 'Cities', Models.City, validFields, 2, {}, undefined).then(function(result) {
                return Q({
                    "params": params,
                    "total_rows": count,
                    "data": _.map(result, function(item){ return item.selectedValues; })
                });
            });
        }
        else {
            return Q({ 
                params: params, 
                total_rows: count, 
                data: []
            });
        }
    });
}).then(function(result) {
    res.send(200, result);
}).fail(function(err) {
    res.send(err.status, err.msg);
});

underscored.js

exports.index = function(req, res) {
  async.waterfall([
    //
    // validate the search string
    //
    // paramValidate protocol :
    // url, sort ording, sorting field, searching field, valid attributes and callback
    _.partial(util.paramValidate, req.url, 'desc', 'id', Models.City.attributes),

    //
    // getting total row count by query values
    //
    function(params, cb) {
      // sqlCount protocol :
      // url, sort ording, sorting field, searching field, valid attributes and callback
      util.sqlCount(params, 'Cities', Models.City, validFields, 2, {}, _.partial(cb, _, params, _);
    },
    //
    // seeking all the row(s) by query values
    //
    function(params, count, cb) {
      if (count > 0) {
        // sqlSelect protocol :
        // url, sort ording, sorting field, searching field, valid attributes and callback
        util.sqlSelect(params, 'Cities', Models.City, validFields, 2, {}, undefined,
        function(err, result) {
          cb(err, {
            "params": params,
            "total_rows":count,
            "data": _.map(result, function(item){ return item.selectedValues; })
          });
        });
      } 
      else {
        cb(null, { 
          params: params, 
          total_rows: count, 
          data: []
        });
      }
    }
  ],
  //
  // final return
  //
  function(err, result) {
    if (err) {
      res.send(err.status, err.msg);

    } else {
      res.send(200, result);
    }
  });
};