20.08 node js

More Node Articles.

There are a lot of Nodejs articles, exploring specific node packages etc.

Manual list:

• 20.00 MEAN tutorial - MEAN stack includes node
• 20.01 node ts threading
• 20.09 From NodeTS to JS
• 20.10 node mail service
• 20.12 nodejs pdf generation
• 20.13 Building Node as EXE
• 20.14 Node-odata + mongo
• 25.00 Javascript being weird
• 25.06 odd numbered Node.js

Built in search:

tag:#code/javascript/node 

Language

classes

if you want to extend a class and use it’s method:

class class1 extends parentClass {
 
    constructor() {
        super();
    }
}

Without the super() you are unable to use the parent class their methods.

This super() passes the variables to the constructor of the class which you are extending.

imports in worker threads

This will work fine:

class class1 {
	name;
    constructor(name) {
        this.name = name;
    }
}
 
module.exports = class1;

const class1 = require('filename')

Because you are importing a class.

But if you have the following:

class class1 {
	name;
    constructor(name) {
        this.name = name;
    }
}
const mainObject = new class1("Henk de Hopper");
 
module.exports = mainObject;

const mainObject = require('filename')

This will give you the same object in every file from a worker thread, but when you have 2 worker threads, they will both have a different mainObject. This means you can’t share them between threads.

NPM Packages / imports{} and requires()

• 20.12 nodejs pdf generation are multiple Packages for pdf generation.
• 20.01 node ts threading is a package for worker threads
• 20.10 node mail service is for sending mails
• 20.07 node MQTT is for MQTT
• 20.05 MongoDB and 20.06 Mongoose are for the MongoDB Database.
• 20.00 MEAN tutorial is half node, half angular. But half node is enough to be mentioned here :3
• chart.js-image to Generate Chart.JS charts as image and embed them everywhere in emails, pdf reports, chat bots…!
  • here I can design the chart.