Efroim Rosenberg efroim102

Not all random values are created equal - for security-related code, you need a specific kind of random value.

A summary of this article, if you don't want to read the entire thing:

Don't use Math.random(). There are extremely few cases where Math.random() is the right answer. Don't use it, unless you've read this entire article, and determined that it's necessary for your case.
Don't use crypto.getRandomBytes directly. While it's a CSPRNG, it's easy to bias the result when 'transforming' it, such that the output becomes more predictable.
If you want to generate random tokens or API keys: Use uuid, specifically the uuid.v4() method. Avoid node-uuid - it's not the same package, and doesn't produce reliably secure random values.
If you want to generate random numbers in a range: Use random-number-csprng.

You should seriously consider reading the entire article, though - it's

The introduction to Reactive Programming you've been missing

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	<?php

	use Symfony\Component\Console\Helper\ProgressBar;
	use Symfony\Component\Console\Output\ConsoleOutput;

	class DoSomething extends Migration
	{
	public function up()
	{
	$output = new ConsoleOutput();

	// Copyright 2017, the Flutter project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	import 'dart:math';
	import 'package:flutter/material.dart';

	void main() {
	runApp(new MyApp());
	}

	-- @desc: The fastest, type-agnostic way to copy a Redis key
	-- @usage: redis-cli --eval copy_key.lua <source> <dest> , [NX]

	local s = KEYS[1]
	local d = KEYS[2]

	if redis.call("EXISTS", d) == 1 then
	if type(ARGV[1]) == "string" and ARGV[1]:upper() == "NX" then
	return nil
	else

	// Live video stream management for HTML5 video. Uses FFMPEG to connect to H.264 camera stream,
	// Camera stream is remuxed to a MP4 stream for HTML5 video compatibility and segments are recorded for later playback
	var liveStream = function (req, resp) { // handle each client request by instantiating a new FFMPEG instance
	// For live streaming, create a fragmented MP4 file with empty moov (no seeking possible).

	var reqUrl = url.parse(req.url, true)
	var cameraName = typeof reqUrl.pathname === "string" ? reqUrl.pathname.substring(1) : undefined;
	if (cameraName) {
	try {
	cameraName = decodeURIComponent(cameraName);

	--- Source: http://solaimurugan.blogspot.ru/2010/10/list-out-all-forien-key-constraints.html

	SELECT
	tc.constraint_name,
	tc.constraint_type,
	tc.table_name,
	kcu.column_name,
	tc.is_deferrable,
	tc.initially_deferred,
	rc.match_option AS match_type,

	// Load the TCP Library
	net = require('net');

	// Keep track of the chat clients
	var clients = [];

	// Start a TCP Server
	net.createServer(function (socket) {

	// Identify this client