Node 6 and Running Node on Docker

May 2016 JaxNode

Brief History

Node 4 and 5 released end of last year
4 was the LTS version
5 the experimental version
Node 6 released, will become a LTS release

ES2015 Features in Node 4

Let and Const

Iterators and Generators

Arrow => functions

Reflection

New literals

Template Strings

Classes

Lexical Scoping

Maps, Set, WeakMap

ArrayBuffer

Promises

Octal support

Node v5.0

V8 engine 4.6
Includes ...spread operator
adds new.target property

Node 6

93% ES2015 compatible
import/export syntax not supported
4 times faster than Node 4
V8 version 5.0.71.35
Node 7 will become experimental version

Buffer Improvements

No longer set Stream to null
Functional changes to Buffer class
use Buffer.from(Array) instead of new Buffer(array) or new Buffer(buffer)
start node with --zero-fill-buffers to enforce new Buffer(size), Buffer.allocUnsafe(size), Buffer.allocUnsafeSlow(size) or new SlowBuffer(size)

Improved Random

var ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';

let random_base64 = function random_base64(length) {
    var str = "";
    for (var i=0; i < length; ++i) {
        var rand = Math.floor(Math.random() * ALPHABET.length);
        str += ALPHABET.substring(rand, rand+1);
    }
    return str;
}

Default parameters


function add(a, b = 0) {
	return a + b;
}

console.log(add(4)); // results 4

Rest parameters


const myAnimals = ['dog', 'cat', 'platipus'];

function listAnimalsES2015(...animals) {
  animals.forEach(function(animal) {
    console.log(animal);
  });
}

listAnimalsES2015(myAnimals);

// returns 
// dog
// cat 
// platipus

Spread Operator

var parts = ['shoulders', 'knees'];
var lyrics = ['head', ...parts, 'and', 'toes']; 
// ["head", "shoulders", "knees", "and", "toes"]

Destructuring

var foo = ["one", "two", "three"];

var [one, two, three] = foo;
console.log(one); // "one"
console.log(two); // "two"
console.log(three); // "three"

const elGatos = ['stan', 'tom', 'bebe', 'alf'];
const [cat1, cat2, ...restOfGatos] = elGatos;
console.log(cat1); // "one"
console.log(cat2); // "two"
console.log(restOfGatos); // "three"

new.target

function Foo() {
  if (!new.target) throw "Foo() must be called with new";
  console.log("Foo instantiated with new");
}

Foo(); // throws "Foo() must be called with new"
new Foo(); // logs "Foo instantiated with new"

Reflect

var O = {a: 1};
Object.defineProperty(O, 'b', {value: 2});
O[Symbol('c')] = 3;

Reflect.ownKeys(O); // ['a', 'b', Symbol(c)]

function C(a, b){
  this.c = a + b;
}
var instance = Reflect.construct(C, [20, 22]);
instance.c; // 42

Proxies

var handler = {
    get: function(target, name){
        return name in target?
            target[name] :
            37;
    }
};

var p = new Proxy({}, handler);
p.a = 1;
p.b = undefined;

console.log(p.a, p.b); // 1, undefined
console.log('c' in p, p.c); // false, 37

Proxy Traps

get
set
deleteProperty
enumerate
ownKeys
has
defineProperty
getOwnPropertyDescriptor

Symbols

var sym1 = Symbol();
var sym2 = Symbol("foo");
var sym3 = Symbol("foo");

Symbol("foo") === Symbol("foo"); // false

var obj = {};

obj[Symbol("a")] = "a";
obj[Symbol.for("b")] = "b";
obj["c"] = "c";
obj.d = "d";

for (var i in obj) {
   console.log(i); // logs "c" and "d"
}

Docker

Follow up to Shawn Hubbards presentation
What are Containers?
New Docker Beta
Docker Commands

Docker Facts

Project started out dotCloud
Written in Go
Using Linux Isolation features of namespaces and cgroups
Offer services like Docker Hub and Docker Cloud
Windows 2016 Server is adding Docker

Docker Beta

Uses hyper-V on Windows
Use xhyve on Mac OS X
Remove need for Oracle VirtualBox
Containers coming to Windows 2016

Docker terms

Docker Engine
Docker Machine
Docker Compose
Docker Swarm
Docker Hub
Docker Cloud

Common Docker Commands

docker build
docker run
docker run -i -t
docker run -d
docker attach
docker ps
docker ps -a
docker commit

Docker-Machine

docker-machine ls
docker-machine create
eval "$(docker-machine env default)"

docker-machine start
docker-machine stop
docker-machine kill

Docker Compose

Organize your containers and services
docker-compose.yml
'docker-compose up' to deploy containers
Gives an abstraction for deploying multiple services

Docker Swarm

Combine a pool of Docker hosts into 1
Can create Clusters
Uses Docker API
Discovery Services
Scheduling

Docker Hub

A host for containers
Publish your containers
Search Public repositories
Pull down to build containers

Docker Cloud

Deploy to your own cloud
Define a node
Define cluster of nodes of same type
Cluster Nodes have to by of the same provider
You can use with AWS, Azure, Digital Ocean or your own hosts

Building Containers

Start with base image
Use Dockerfile to define and set up
Can run and commit, but better to use Dockerfile
For Nodejs apps, split the npm install and adding code step into separate steps

Dockerfile

FROM node:6.1.0

RUN mkdir /src
COPY package.json /src
WORKDIR /src 
RUN npm install

ENV foo bar
 
# Add your source files
COPY . /src  
CMD ["npm","start"]

Dockerfile commands

FROM specify base container image
ADD/COPY lets you add files to container
RUN will let you run a Bash command
CMD takes an array of commands
ENV sets up an environment variable
EXPOSE exposes a port
USER to set the user
WORKDIR to set the directory your working dir

Docker Build

bash > docker build -t username/container:version /src

Docker run

bash > docker run -d -p 80:3000 username/container:version

Node 6 and Running Node on Docker

Brief History

ES2015 Features in Node 4

Node v5.0

Node 6

Buffer Improvements

Improved Random

Default parameters

Rest parameters

Spread Operator

Destructuring

new.target

Reflect

Proxies

Proxy Traps

Symbols

Docker

Docker Facts

Docker Beta

Docker terms

Common Docker Commands

Docker-Machine

Docker Compose

Docker Swarm

Docker Hub

Docker Cloud

Building Containers

Dockerfile

Dockerfile commands

Docker Build

Docker run

Honorable Mentions

Demo

Code

Questions

Contact