How to use the hazelcast-client.Predicates function in hazelcast-client

* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

var Client = require('hazelcast-client').Client;
var Aggregators = require('hazelcast-client').Aggregators;
var Predicates = require('hazelcast-client').Predicates;

Client.newHazelcastClient().then(function (hazelcastClient) {
    var client = hazelcastClient;
    var map;
    hazelcastClient.getMap('person-age-map').then(function (mp) {
        map = mp;
        return map.putAll([
            ['Philip', 46],
            ['Elizabeth', 44],
            ['Henry', 13],
            ['Paige', 15]
        ])
    }).then(function () {
        return map.aggregate(Aggregators.count());
    }).then(function (count) {
        console.log('There are ' + count + ' people.');

* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

var Client = require('hazelcast-client').Client;
var Config = require('hazelcast-client').Config;
var Predicates = require('hazelcast-client').Predicates;
var HazelcastJsonValue = require('hazelcast-client').HazelcastJsonValue;
var JsonStringDeserializationPolicy = require('hazelcast-client').JsonStringDeserializationPolicy;

var config = new Config.ClientConfig();
config.serializationConfig.jsonStringDeserializationPolicy = JsonStringDeserializationPolicy.NO_DESERIALIZATION;

Client.newHazelcastClient(config).then(function(hz) {
    var map;
    return hz.getMap('employees').then(function(mp) {
        map = mp;
        var employees = [
            { name: 'Alice', age: 35 },
            { name: 'Andy', age: 22},
            { name: 'Bob', age: 37 }
        ];

* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

var Client = require('hazelcast-client').Client;
var Config = require('hazelcast-client').Config;
var Predicates = require('hazelcast-client').Predicates;
var cfg = new Config.ClientConfig();

//This comparator is both a comparator and an IdentifiedDataSerializable.
//Note that a comparator should be a serializable object( IdentifiedDataSerializable or Portable)
//because Hazelcast server should be able to deserialize the comparator in order to sort entries.
//So the same class should be registered to Hazelcast server instance.
var comparator = {
    getFactoryId: function () {
        return 1;
    },

    getClassId: function () {
        return 10;
    },

    //This comparator sorts entries according to their keys in reverse alphabetical order.

*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

var Client = require('hazelcast-client').Client;
var Predicates = require('hazelcast-client').Predicates;
var Config = require('hazelcast-client').Config;

function User(username, age, active) {
    this.username = username;
    this.age = age;
    this.active = active;
}

User.prototype.readPortable = function (reader) {
    this.username = reader.readUTF('username');
    this.age = reader.readInt('age');
    this.active = reader.readBoolean('active');
};

User.prototype.writePortable = function (writer) {
    writer.writeUTF('username', this.username);