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#dart:convert example

How to pretty-print JSON using Dart.

How to display JSON in an easy-to-read (for human readers) format.

Main library: dart:convert
Main element: JsonEncoder.withIndent
Gist: https://gist.github.com/kasperpeulen/d61029fc0bc6cd104602

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import 'package:architecture_playground/home_page.dart';
import 'package:architecture_playground/services.dart';
import 'package:flutter/material.dart';

void main() async {
  // perform long-running tasks before "runApp" to display the native splash screen
  final services = await Services.initialize();

  runApp(ServicesProvider(
    services: services,

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PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

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Node.js Deployment

Steps to deploy a Node.js app to DigitalOcean using PM2, NGINX as a reverse proxy and an SSL from LetsEncrypt

1. Sign up for Digital Ocean

If you use the referal link below, you get $10 free (1 or 2 months) https://m.do.co/c/5424d440c63a

2. Create a droplet and log in via ssh

I will be using the root user, but would suggest creating a new user

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var async = require('async');

var arr = [1,2,3,4];

async.eachSeries(arr,function(item, cb){
  setTimeout(function() {
    console.log('#1: ', item);
    return cb();
  }, Math.random()*2000);
}, function(err){

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What is your folder-structure preference for a large-scale Node.js project?

0: Starting from Rails

This is the reference point. All the other options are based off this.

|-- app
|   |-- controllers
|   |   |-- admin

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//Input :************************************************************************************************************************************

[
    {
        "commissioningDate": "2019-09-27",
        "_product": {
            "_id": "aaa",
            "name": "Installation"
        },
        "zones": [

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nest.js

A multi-level groupBy for arrays inspired by D3's nest operator.

Nesting allows elements in an array to be grouped into a hierarchical tree structure; think of it like the GROUP BY operator in SQL, except you can have multiple levels of grouping, and the resulting output is a tree rather than a flat table. The levels in the tree are specified by key functions.

See this fiddle for live demo.

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/**
 * Javascript - 
 *   Array multiple groupBy function
 *   Forked from http://codereview.stackexchange.com/questions/37028/grouping-elements-in-array-by-multiple-properties
 *
 * Usage:
 *   var list = [
 *     { foo: "bar", id: 1  },
 *     { foo: "barbar", id: 2  },
 *     { foo: "bar", id: 1  },