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export const createReferenceNumbers = (
    baseStr: string = "000",
    qty = 10,
    international = false
): string[] => {
    const baseNumber = BigInt(baseStr);
  
    return Array.from({ length: qty }, (_value, idx) => {
        const base = String(baseNumber + BigInt(idx));
        const checksum: number =

vsnikkil

// does not work on edge
((a, {b = 0, c = 3}) => { return a === 1 && b === 2 && c === 3; })(1, { b: 2 });

// works, surprisingly
((a, {b = 0, c = 3} = {}) => { return a === 1 && b === 2 && c === 3; })(1, { b: 2 });

// works
(({b = 0, c = 3}) => { return b === 2 && c === 3; })({ b: 2 });

// works

vsnikkil

ImmutableJS

Immutable data cannot be changed once created, leading to much simpler application development, no defensive copying, and enabling advanced memoization and change detection techniques with simple logic. Persistent data presents a mutative API which does not update the data in-place, but instead always yields new updated data.

--- Immutable.js

Some concepts of functional programming

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const a = (idx = 1, color = 'black') => { console.log(`%c ${ [...new Array(Math.round(50*(1+Math.sin(idx/10))))].map(() => '*').join('') }`, `color: ${color}`); setTimeout(() => a(idx+1, color), 20) }; a()

// Node
var x = idx => { console.log(''.padStart(Math.floor(process.stdout.columns / 2 * (1 + Math.sin(idx))), '*')); setTimeout(() => x((idx + 0.1) % (2 * Math.PI)), 20) }; x(0)

vsnikkil

{
  "env": {
    "browser": true,
    "node": true,
    "es6": true,
    "amd": true,
    "jest/globals": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {

vsnikkil

const webpack = require('webpack')

module.exports = {
  devtool: process.env.NODE_ENV === 'production' ? 'cheap-module-source-map' : 'eval',
  module: {
    loaders: [
      {
        test: /\.js?$/,
        exclude: /node_modules/,
        loader: 'babel',

vsnikkil

import User from './User'
import Session from './Session'

/* Associations */
User.hasMany(Session)

/* Hooks */
User.afterDestroy(async (user, options) => {
  await Session.destroy({
    where: { userId: user.id },