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
clientemits other commands different than previous one, it responses withUnknownmessage.
The workflow could be:
- The
clientemitcommandsthat user writes in the terminal/console.Serveris listening thatcommands. - The
serveremit aresponsefor each command.Clientis listening thatresponse.
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.
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