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Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

PostgreSQL is Enough

Background and Cron Jobs

Add class

  render(): JSX.Element {
    const {classes, title} = this.props;
    return (
      <>
         <TextField
           className={classes.TextField}
           ...

	// Using "var" here to easily change the parameters and resubmit the code in a JS dev console!
	var url = 'http://127.0.0.1:3000/login';

	var parameters = {
	user: 'bennyn',
	password: 'secret'
	};

	fetch(url, {
	method: 'post',

	const test = {
	tree: {
	branch1: 10,
	branch2: 20,
	}
	};

	const copies = {};

	for (let i = 0; i < 10; i++) {

	const Hawk = require('@hapi/hawk');
	const request = require('request');

	const API_KEY = 'KEY';
	const API_KEY_ID = 'ID';

	const credentials = {
	id: API_KEY_ID,
	key: API_KEY,
	algorithm: 'sha256'

	// Compliant Promise/A+ implementation: https://www.promisejs.org/implementing/
	// Alternative implementation: https://dexie.org/docs/Promise/Promise
	// Checkout the Node.js Event Loop: https://www.youtube.com/watch?v=PNa9OMajw9w
	// Bluebird breaking change: http://bluebirdjs.com/docs/new-in-bluebird-3.html#cancellation-overhaul

	const Promise = require('bluebird');

	Promise.config({
	cancellation: true,
	});

	<!DOCTYPE HTML>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link
	rel="stylesheet"
	href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.1/normalize.css"
	>
	<style>

	<f:comment>Regular syntax</f:comment>

	<v:condition.iterator.contains needle="<the page id>" haystack="{v:page.rootline() -> v:iterator.extract(key: 'uid')}">
	<f:then></f:then>
	<f:else></f:else>
	</v:condition.iterator.contains>

	<f:comment>Inline syntax</f:comment>

	{v:condition.iterator.contains(

	Playlist: https://www.youtube.com/playlist?list=PLCbdBdyNHZXLX9p_F8WCPwXHn67QlstZ9
	Video in Playlist: https://www.youtube.com/watch?v=qZN0Lo-f3iE&list=PLCbdBdyNHZXLX9p_F8WCPwXHn67QlstZ9
	Video: https://www.youtube.com/watch?v=qZN0Lo-f3iE