Nguyenanh

curl -X POST \
-H "Authorization: key= YOUR-API-KEY" \
-H "Content-Type: application/json" \
-d '{ 
"registration_ids": [ 
"YOUR-GCM-REGISTRATION-ID"
], 
"data": { 
"message": "Hello Message"
},

Nguyenanh

Concurrency in JavaScript

Javascript is a programming language with a peculiar twist. Its event driven model means that nothing blocks and everything runs concurrently. This is not to be confused with the same type of concurrency as running in parallel on multiple cores. Javascript is single threaded so each program runs on a single core yet every line of code executes without waiting for anything to return. This sounds weird but it's true. If you want to have any type of sequential ordering you can use events, callbacks, or as of late promises.

Nguyenanh

Concurrency in JavaScript

Javascript is a programming language with a peculiar twist. Its event driven model means that nothing blocks and everything runs concurrently. This is not to be confused with the same type of concurrency as running in parallel on multiple cores. Javascript is single threaded so each program runs on a single core yet every line of code executes without waiting for anything to return. This sounds weird but it's true. If you want to have any type of sequential ordering you can use events, callbacks, or as of late promises.

Nguyenanh

Concurrency in JavaScript

Javascript is a programming language with a peculiar twist. Its event driven model means that nothing blocks and everything runs concurrently. This is not to be confused with the same type of concurrency as running in parallel on multiple cores. Javascript is single threaded so each program runs on a single core yet every line of code executes without waiting for anything to return. This sounds weird but it's true. If you want to have any type of sequential ordering you can use events, callbacks, or as of late promises.

Nguyenanh

# app deps
sudo yum install git

# erlang deps
sudo yum groupinstall "Development Tools"
sudo yum install ncurses-devel openssl-devel

# erlang
wget http://www.erlang.org/download/otp_src_19.2.tar.gz
tar -zxvf otp_src_19.2.tar.gz

Nguyenanh

##### Replace 'example' anywhere with the name of your app and '*ec2ip*' with your ec2 instance ip
##### Set up your instance and make sure it's security group has ssh, http, and https open inbound and outbound
##### Don't forget to chmod 400 cert.pem

##### .deliver/config
APP="example"

BUILD_HOST="*ec2ip*"
BUILD_USER="elixir_builder"
BUILD_AT="/home/$BUILD_USER/edeliver/$APP/builds"

Nguyenanh

    def preload_association(records)
      ::ActiveRecord::Associations::Preloader.new.preload(
        records,
        @association_schema,
        @preload_scope
      ).then(&:first).then do |preloader|
        next unless @preload_scope
        # The result of previous preload is memoized, ActiveRecord won't load this association again.
        if preloader.is_a?(::ActiveRecord::Associations::Preloader::AlreadyLoaded)
          owner = preloader.send(:owners).first

Nguyenanh

Problem

Installing mysql2 gem errors on MacOS Mojave.

Solution

Make sure openssl is installed on Mac via Homebrew.

brew install openssl

Nguyenanh

$ sudo yum install libxml2-devel
Loaded plugins: fastestmirror, priorities, security
Loading mirror speeds from cached hostfile
amzn-main                                                                                                                                                                                 | 2.1 kB     00:00     
amzn-updates                                                                                                                                                                              | 2.3 kB     00:00     
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package libxml2-devel.x86_64 0:2.7.6-4.11.amzn1 set to be updated
--> Processing Dependency: pkgconfig for package: libxml2-devel-2.7.6-4.11.amzn1.x86_64

Nguyenanh

#!/bin/bash

###############################################
# To use: 
# chmod +x install-redis.sh
# ./install-redis.sh
###############################################

version=5.0.0