Node training

In this training we will see the advantages developing with Node. We will also introduce the Document-oriented databases using Mongo / Mongoose. Each sample contains a README.md file that indicates the purpose of the sample plus a step by step guide to reproduce it.

Samples

01 Node

00 Intro

00 Installing Node and IDE

In this sample we are going to install and configure Node.js and VS Code.

01 Hello

In this sample we are going to create a hello.js file with console.log message and a VS Code launch.json file to run our first Node server.

02 Basic Server

In this sample we are going to create a simple NodeJS server that listen on port 3000.

03 Callback

In this sample we are going to learn how to keep clean our code using callbacks.

04 Process

In this sample we are going to use the global object process and playing with the exit and uncaughtException events.

05 Buffer

In this sample we are going to learn about Buffer. We will create three samples managing buffers.

06 JSON Addons

In this sample we are going to play with Node.js addons.

01 Modules

00 Built in

In this sample we are going to learn how to require Node built-in modules. As example we are going to use os module and show some methods like hostname, loadavg and freemem.

01 File module

In this sample we are going to learn how to create a custom module and export it to be used in other file using CommonJS modules.

02 NPM modules

In this sample we are going to learn how to create and configure a package.json file, install a npm third library and use it.

02 Concurrency Model and Event Loop

00 Slow Operation

In this sample we are going to demonstrate how to get a blocking code.

01 SetImmediate

In this sample we are going to learn about setImmediate vs setTimeout methods.

02 NextTick

In this sample we are going to learn how to use nextTick method.

03 Events

00 Handling Async Code

In this sample we are going to working with async code using callbacks, Promises and async/await.

01 Events

In this sample we are going to create a basic sample to work with Node.js Events.

02 External emitter

In this sample we are going to use previous sample, require it from other file and create different instances of EventEmitter.

03 Sync to async class

In this sample we are going to learn how to migrate sync function using events to async code.

04 Task list

In this sample we are going to create two EventEmitters instances splitted in two files and one unique node process. That is, each EventEmitter has its own file. So, we'll have the client and server files.

We need a comunication between client and server. To simplify it, the server receives a client instance like:

./client.js

const client = new EventEmitter();
const server = require('./server')(client);

./server.js

class Server extends EventEmitter {
  constructor(client) {
  }
  ...
}
...
module.exports = (client) => new Server(client);

The aim of this sample is implement a Task list where the server are listening each command (event) emitted by client. The commands are:

• add: Add a task to the list.
• delete: Remove a task from the list.
• ls: Show all tasks in the list.
• help: Give info about commands.

NOTE: if client emits other commands different than previous one, it responses with Unknown message.

The workflow could be:

• The client emit commands that user writes in the terminal/console. Server is listening that commands.
• The server emit a response for each command. Client is listening that response.

04 Web

00 Http Server

In this sample we are going to create a basic server using server.on('request') and see info about HTTP server response.

01 Http Server Stream

In this sample we are going to learn the differences between res.write and res.end.

02 Http Client

In this sample we are going to learn how to make HTTP request from Node.

03 Routes

In this sample we are going to learn how create an http server and manage different routes.

05 Built-in Libraries

00 OS

In this sample we are going to see some os module methods.

01 FS Delete

In this sample we are going to create an app for delete files older than 7 days.

02 FS Truncate

In this sample we are going to create an app for truncate a corrupted file with duplicated code.

03 FS Watch

In this sample we are going to implement app to watch files in specific folder.

06 Streams

00 Intro Readable Stream

In this sample we are going to send an http request to understand a readable stream.

01 Reading Big Files

In this sample we are going to learn how to improve performance reading big files using pipes.

02 Readable Stream

In this sample we are going to play with Readable class from stream module.

03 Writable Stream

In this sample we are going to play with Writable class from stream module.

04 Duplex

In this sample we are going to play with Duplex class from stream module.

05 Transform

In this sample we are going to play with Transform class from stream module.

06 Zip

In this sample we are going to use the zlib module to crompress a file and using streams and pipes.

02 Mongo

00 Intro

00 Installing Mongo

In this sample we are going to install and configure MongoDB.

01 Connect MongoClient

In this sample we are going to install mongodb via npm and use it to create a connection with a database.

01 Create Database

In this sample we are going to create a new database and collection and connect to it.

02 Insert

In this sample we are going to insert new user in users collection.

03 Query Documents

In this sample we are going to reuse the db object and create queries to find documents.

04 Update Documents

In this sample we are going to implement some database business and create queries to update documents.

05 Remove Documents

In this sample we are going to implement some database business and create queries to remove documents.

About Lemoncode

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