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Parse.Cloud.beforeSave("Requests", function(request, response) {
	var postObj = new Parse.Object("Posts");
	postObj.set("objectId", request.object.get("Post_Pointer"));
	
	var query = new Parse.Query("Requests");
	query.equalTo("Post_Pointer", postObj);
	query.equalTo("Requester", Parse.User.current());
	query.first({
	    success: function(object) {
	        if (object) {

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Parse.Cloud.beforeSave("Posts", function(request, response) {
    if (request.object.existed()) {
        return response.success(); // the Post already exist, this must be an Update action
    } 
    // do a query to "Posts" to check the oldest related "Posts" to current user
    var query = new Parse.Query("Posts");
    query.equalTo("PostUser", Parse.User.current());
    query.equalTo("Topic", YOUR_REFERENCED_TOPIC_OBJECT); // assume you are want to reference it by pointer
    query.descending("createdAt");

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Parse.Cloud.define("testSave", function(request, response) {
    var id = request.params.class1Id;
    var query = new Parse.Query('Class1');
    query.include('Class2Pointer');
    query.get(id).then(function (Class1) {
        var Class2 = Class1.get('Class2Pointer');
        Class2.set('text', 'snoopy');
        // test 1: this will have duplicate save two times
        Class2.set('Class1Pointer', Class1);
        // test 2: this will save once

jeffhuangtw

/*
 * Author: Felipe Herranz (felhr85@gmail.com)
 * Contributors:Francesco Verheye (verheye.francesco@gmail.com)
 * 		Israel Dominguez (dominguez.israel@gmail.com)
 */	
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

import android.os.Handler;

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Parse.Cloud.define("TestUpload", function(request, response) {
    var attachmentURLs = [];
    attachmentURLs.push({'name': 'gogole_logo', 'url': 'https://www.google.com.tw/intl/en_ALL/images/srpr/logo11w.png', 'content-type': 'image/png'});
    attachmentURLs.push({'name': 'yahoo_logo', 'url': 'https://www.google.com.tw/images/nav_logo225.png', 'content-type': 'image/png'});

    var promises = [];
    attachmentURLs.forEach(function(file){
        promises.push(Parse.Cloud.httpRequest({
            url: file.url,
          }).then(function(fetchedFile){

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var queryAllUser = new Parse.Query(Parse.User);
Parse.Cloud.useMasterKey();
queryAllUser.each(function(user) {
  var queryMatch = new Parse.Query(Parse.User);
  queryMatch.containedIn("offer", user.get("search"));
  return query.find().then(function(users) {
    if (users.length >0) {
      var targetList = [];
      for (i = 0; i < users.length; i++) {
        var userPointer =  Parse.Object.extend(Parse.User);

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// resend verify email
Parse.Cloud.define("ResendVerifyEmail", function(request, response) {
    var user = Parse.User.current();
    if (!user) {
        response.error("INVALID_USER");
        return;
    }
    var email = request.params.email;
    var query = new Parse.Query(Parse.User);
    Parse.Cloud.useMasterKey();

jeffhuangtw

Coursera course
https://www.coursera.org/learn/machine-learning

Week 1 Note:
Partial derivative in gradient descent for two variables
https://math.stackexchange.com/questions/70728/partial-derivative-in-gradient-descent-for-two-variables/189792#189792

Gradient descent
https://www.youtube.com/watch?v=WnqQrPNYz5Q&ab_channel=AlexanderIhler

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// Google Play API Key
// ref: http://stackoverflow.com/questions/35127086/android-inapp-purchase-receipt-validation-google-play
// ref: https://developers.google.com/android-publisher/authorization
// ref: http://google.github.io/google-api-nodejs-client/18.0.0/index.html#toc14__anchor
//
// install npm package
// ref: https://github.com/google/google-api-nodejs-client
// $ npm install googleapis --save
//
const google = require('googleapis');

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// 1. add a executable dev.sh to run your script (example: web.js)
#!/bin/bash
node --inspect web.js

// 2. install foreman
$ npm install -g foreman

// 3. prepare your environment variables file
$ touch .env