igor.js igorjs

Tutorial: scheduled start/stop of EC2 instances managed by Auto Scaling Groups

If your EC2 instances in AWS are managed through Auto Scaling Groups, it is easy to schedule startup and shutdown of those instances, e.g. to save money.

This tutorial walks you through setting up an AWS Lambda function that is triggered by CloudWatch Events and automatically changes the min, max and desired instances in your Auto Scaling Group(s).

The idea is to toggle between 0 (stop) and a specifed min, max and desired amount of instances (start), so you only need a single Lambda function. The premise is that you do not touch these Auto Scaling Group settings manually, or you might make your EC2 instances nocturnal.

Create new Lambda function and Start Event

Following this article:

SSH Server configuration

The machine that will host the git repository needs to be accessed by clients. A possible way to access a machine remotely is through SSH.

Node.JS best practices and conventions

This is not about JS style

Advice: if you have style guide / policy, apply it automatically ( in the editor or git hook ) https://github.com/jshint/fixmyjs

Collection of (mostly) JS styles (pick one you like or write another one if none fits you)

list of lists: http://www.jstherightway.org/

React - Functional error boundaries

Thanks to React hooks you have now happily turned all your classes into functional components.

Wait, all your components? Not quite. There is one thing that can still only be implemented using classes: Error boundaries.

There is just no functional equivalent for componentDidCatch and deriveStateFromError yet.

Proposed solution

What I Wish I'd Known About Equity Before Joining A Unicorn

Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.

This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would

	export function safeThrow(
	target: object,
	key: string \| symbol,
	descriptor: TypedPropertyDescriptor<(req: Request, res: Response, next: NextFunction) => Promise<any>>) {
	const fun = descriptor.value;
	descriptor.value = async function () {
	try {
	await fun.apply(this, arguments);
	} catch (err) {
	arguments[2](err);

	(function(appModule) {

	"use strict";

	var Apollo = function () {
	function Apollo(client, $q) {
	this.client = client;
	this.$q = $q;
	}

	// scraped from https://mariadb.com/kb/en/mariadb/documentation/sql-language-structure/mariadb-error-codes/
	//
	module.exports = [
	[
	"1000",
	"HY000",
	"ER_HASHCHK",
	"hashchk"
	],
	[

	definitions:
	caches:
	poetry-path: /root/.poetry
	poetry-venv: /root/.cache/pypoetry/virtualenvs

	steps:
	- step: &step-37
	image: python:3.7
	caches:
	- poetry-path

	interface IXOptions {
	a?: string,
	b?: any,
	c?: number
	}

	const XDefaults: IXOptions = {
	a: "default",
	b: null,
	c: 1