Javascript Abstract Classes

Question

How can I have an abstract class and its extended classes in the same file?

for example: in forms.js

class default {
  constructor(width){
    this.width = width
  }
  area(){
    return this.width ** 2
  }
}

module.exports = class cubo extends default {
  some unique stuff for cube...
}

How can I create a cube reference in my index.js? I’ve already tried:

const formas = require('./formas.js')
const cubo = new Cubo(width)

and tried that too:

const formas = require('./formas.js')
const cubo = new formas.Cubo(width)

What I’m doing wrong?

Answer 1

Your formas in the file you matter will be equal to module.exports of the file exporting.

Export like this:

class default {
  constructor(width){
    this.width = width
  }
  area(){
    return this.width ** 2
  }
}

class Cubo extends default {
  some unique stuff for cube...
}

module.exports = Cubo

Import like this:

const Cubo = require('./formas.js')
const cubo = new Cubo()