Node js : Best way to define entity class

 

If you start to use a DB like mongo, you might be better off creating objects with mongoose but that's personal preference as well. As for your example -

1) Export Person

module.exports = Person;

2) Import Person from another file

const
Person = require('../path/to/Person');

3) Create Person with the new keyword to call the constructor (very important)

const mitch = new
Person('Mitch');

You should read up on javascript's prototype. Every object has a reference to Object.prototype. Then you can create objects with Object.create(obj) to create objects and assign the new object's prototype as the reference being passed in to Object.create(obj)

Here's an example from MDN

// Shape - superclass

function
Shape() {

this.x = 0;

this.y = 0;

}

 

// superclass method

Shape.prototype.move = function(x, y) {

this.x += x;

this.y += y;

console.info('Shape moved.');

};

 

// Rectangle - subclass

function
Rectangle() {

Shape.call(this); // call super constructor.

}

 

// subclass extends superclass

Rectangle.prototype = Object.create(Shape.prototype);

Rectangle.prototype.constructor = Rectangle;

 

var rect = new
Rectangle();

 

console.log('Is rect an instance of Rectangle?',

rect instanceof
Rectangle); // true

console.log('Is rect an instance of Shape?',

rect instanceof
Shape); // true

rect.move(1, 1); // Outputs, 'Shape moved.'

 

From: https://stackoverflow.com/questions/47006288/node-js-best-way-to-define-entity-class